Home
Aplusclick Grade 11 Questions
The speed of light is 3 x 10
5
kilometers/second. If the sun is . . .
The North American emergency telephone number is 911. How many three-digit . . .
Choose the answer without using a calculator. Which number is evenly . . .
How many sets of at least two consecutive positive integers have a sum of 15?
What is the sum of all the digits (not numbers) in the sequence 1, 2, 3, 4, . . . . .
How many three-digit numbers which are multiples of 7 end with the digit 4?
The date July 31, 1370 in MM/DD/YYYY format is a palindrome that may be read . . .
We use the decimal number system with base 10. The binary numeral system . . .
How many two-digit numbers have exactly five divisors including 1 and . . .
Make 33 by using three 3s and any math operators. How many times do you use . . .
The sum of two prime numbers is equal to 888. There are several options. We . . .
The last digit of the number 9
100
is
The typical healthy resting heart rate in adults is 60–80 beats per minute. . . .
Pairs of primes separated by a single number are called prime pairs. Examples . . .
Find the last 3 digits of the sum of 1 + 11 + 111 + . . . + 111 . . . 111, . . .
A number is palindromic, if it is the same backwards as forwards. Of the . . .
If you sum all the numbers between 1 and 11111, what number is the result? By . . .
Which is not correct? Remember that 3! = 1 x 2 x 3
You can throw an unlimited number of darts at the dartboard. Some total . . .
How many sets of three consecutive integers whose product is equal to their sum . . .
If the sum of three distinct positive integers is 33, what is the maximum . . .
The product of two integers is 1000. Neither of the numbers contains a zero. . . .
What is a mystery number if you add it to 1, then multiply by 2, then add 3, . . .
The product of 99 integers is 99. What is the largest possible value the sum . . .
What is the smallest number greater than 2000 that is evenly divisible by all . . .
How many digits are in the number 20
15
?
What is the smallest 7-digit prime number? A prime number is a natural number . . .
Leslie Green asks: Find the ratio A/B where A is the number of elements in . . .
As n goes to infinity, what is the limit of n / (n-1)?
The product of real positive numbers a, b, c, and d is equal to 1. What is . . .
The sum of the digits of a four-digit number is 15. All the digits are . . .
Find the sum of the digits of the first 100 positive integers: 1 + 2 + 3 + . . .
Simplify the expression 12(3 + x) – 4(5x – 6).
In the equation y = 9x
2
– 1, which is the value of x when y = . . .
Simplify
What transformation creates an image with a vertex at the origin?
What relation goes through points A, B and C?
Which point would be on a line passing through C and perpendicular to the line . . .
Between what two whole numbers does the result lie?
Which of the following green areas best represents the graph of the inequality . . .
A
is the set of all points (x,y) in the shaded region. Find the set . . .
Which of the following graphs represents all values of x such that
The last digit of the number 3
33
is:
Which of the following could be a value of x?
A perfect cube is an integer whose cube root is an integer. For example, 64 . . .
2 + 2 = 5 Find an error in the proof.
Find the expression that is INCORRECT.
Find the expression that is INCORRECT.
Find the value of F, if a = 0.2.
Eugenia used 192 digits to number the pages in her diary. How many pages . . .
Which of the following gives the largest value?
Do these rays have one point of intersection? If yes, find the x-coordinate . . .
What is the largest product of positive integers that add up to 17?
Identify the location of point E after the transformation (x
2
+ 4, . . .
How much does the maximum value of 2 - 2sin(x) exceed the maximum value of . . .
Which point is on the axis of symmetry of the graph of the parabola?
Xia and Yvonne collect buttons. Xia only collects the ones with two holes and . . .
Nine teams enter a basketball tournament. Each team plays one match against . . .
A frog ate 20 flies in a day. Each day, the frog ate 20 more than on the day . . .
If the admittance rate to a prestigious university is 7.5% and 810 students . . .
Mr. Rapid always starts driving on a motorway at exactly 7:00 a.m. If he . . .
In a city, three-quarters of the men are married to four-fifths of the women. . . .
Mr. Rapid always starts driving on a road at exactly 7:00 a.m. If he drives on . . .
There are N students in a class and only 8 of them are girls. If 11 boys . . .
The rear tires of my car wear out after 40,000 miles, whilst the front tires . . .
X
2
= 4004001 Find X without using a calculator.
Ben ate 100 bananas between Monday and Friday, stopping for the weekend. . . .
Which gives the smallest answer if X and Y are integers, X is greater than . . .
On an island, the ratio between the number of adult men and the number of adult . . .
Which number could be written as a sum of 4 consecutive numbers?
Figure out without using a calculator which product is greater:
It takes two gardeners 6 days to mow a lawn. One is lazy and one is . . .
Derek dragon became a vegetarian two years ago. Derek likes to eat 3 baskets . . .
Find the ratio of the green and blue areas
y = x
2
.
Which of the following gives the largest answer?
I participate in a 10-day rally. The rear tires of my car wear out after 4,000 . . .
Two trains start at the same time, one from Zurich to Lausanne, the other from . . .
A rectangle has a width of 0.3x and a length of 0.4x. Which formula is the . . .
Which gives the largest answer?
The edges of a large cube are 3 times longer than the edges of a small cube. . . .
An arrow rotates 366° in one second. How many revolutions does it make in . . .
Two satellites orbit at 1/4 R above Earth's surface. R is the radius of the . . .
A mathematician wants to approximate the width of a lake. He places 5 markers . . .
What transformation creates an image with a vertex at the origin?
What is the area of the colored shape?
Angles A and C are equal to 90
o
. Which proportion is true?
Each interior angle of a regular polygon measures 144
o
. How many . . .
A square garden is 401 square meters. The minimum distance between apple . . .
If the Earth's radius is twice the radius of planet M, then how much bigger is . . .
A boy is making boxes from cardboard. He is going to cut square pieces off . . .
Alex wants to arrange the cylinders from least to greatest volume. What is . . .
Which shape would be made if the two sections were fitted together?
Five boys Andrew, Brandon, Chris, Daniel, and Ethan live on State Street. At . . .
A boy cuts a cardboard circle and only cuts 5 straight lines. He does not . . .
How many planes of symmetry does a cube have?
How many boxes measuring 0.1m x 0.1m x 6.9m can be packed into a container . . .
The figure shows a pyramid made of small squares. I want to move the small . . .
The American flag consists of thirteen equally spaced, horizontal red and white . . .
The figure shows a regular pentagon. Compare the values of angles A and B.
Divide the analog watch face with two straight lines so that the sums of the . . .
Look at the mini-golf course. To what point would the player hit the golf . . .
How many interior right angles are possible in a polygon with seven sides?
Bill mows the front lawn, which is a 7m by 10m rectangle. The mower cuts a 1m . . .
Among the following shapes of equal area, which has the largest perimeter?
A block of wood in the form of a cuboid 9 x 10 x 11 has all its six faces . . .
I fold a square piece of paper in half four times without unfolding, making an . . .
How many squares can be formed by joining four of these points on the . . .
If I tile a floor with 3000 regular hexagonal tiles as shown here how many . . .
Path C consists of straight segments. Path D and E consist of semi-circles. . . .
A circle is drawn through two vertices of a square so that it is tangent to . . .
I placed together four identical triangles and the square, without overlaps, to . . .
Compare areas F and G
What is the sum of the marked angles?
Eight points are equally spaced on a circle. How many right angled triangles . . .
The picture shows six equilateral triangles. The sides of the triangles are . . .
The picture shows a tiling pattern which is made of square green tiles 10 x 10 . . .
Fifteen billiard balls perfectly fit into a triangular rack. What is the . . .
What is the smallest number of segments that needs to be moved so that the . . .
All three circles are tangent to the horizontal line and to one another. The . . .
A girl wants to cut the paper into several equal pieces of the same shape, and . . .
Two lines and two diagonals are drawn through the center of the rectangle. . . .
How many circles are needed to separate each star from all of the others?
I would like to cut the shape into the fewest possible pieces that will fit . . .
The colored figure in the picture consists of isosceles right triangles. . . .
The vertices of the smaller square divide each side of the larger square by a . . .
I blew some air into a spherical balloon and quadrupled its surface area (4 . . .
Estimate the area of the largest equilateral triangle that can fit within a 1x1 . . .
Four matchsticks form a square. How many non-overlapping squares can be . . .
Guesstimation. How many tennis balls can fit in a school bus?
What is the maximum number of apples (ideal spherical units) that can touch . . .
I arranged twelve one-inch wooden sticks in a polygon with an area of 6 square . . .
Which reservoir has the smallest volume?
Anna has made puzzle pieces by cutting wedges from a disk. Each wedge cut from . . .
How many coins do I need to melt down and recast to get a single coin of double . . .
Shape A and B are congruent equilateral triangles. Shape C is formed by . . .
The diagram illustrates a row of three squares formed by matches. How many . . .
A boy stacked colored cubes in a square pyramid like the one shown here. The . . .
The figure shows a red equilateral triangle inscribed within another . . .
The three circles have fixed centers, and the diameter of a circle is 7 / 8 of . . .
For this rectangular solid, which plane(s) contain(s) C and is/are parallel to . . .
Two similar pyramids have volumes of 343 m
3
and 64 m
3
. . . .
Among the following shapes of equal perimeter, which has the smallest area?
Which triangle with sides a, b, and c has the largest area?
Squares 1, 2 and 3 have sides of length 1, 2 and 3 units, respectively. What . . .
A square with a side length 20 has two vertices on the circle, and one side . . .
Two squares, each with sides measuring 2 cm, are placed such that a vertex of . . .
A recipe makes 5 pizzas that are 12 inches in diameter. If I decide to make . . .
Two congruent circles share a radius. What is the perimeter of the figure . . .
What is the area of a garden?
The large and small circles touch each other. What part of the large circle . . .
Estimate how long the rope is if its diameter is 1 cm.
Find the ratio of the areas of the large and small squares.
What is the largest possible side size of an equilateral triangle that fits . . .
The hypotenuse of a right triangle is 6, and the length of one leg is 2 units . . .
What part of the rectangle is red if points A and B are the midpoints of the . . .
How many lines can be drawn in a plane so that they are equidistant from 3 . . .
Three overlapping squares form 5 squares including themselves in the picture. . . .
You have a 5kg weight and a 12kg weight. They are the same height and are . . .
Estimate the maximum number of smaller 1-inch circles that fit in a larger . . .
What is the volume in cubic inches of the pyramid with height 10 inches? The . . .
I want to divide this shape into four congruent pieces - all of precisely the . . .
Which pyramid has the largest volume?
Find the area of the colored rectangle.
Which line goes through the center of the circle?
All sides of the white cross are the same. What percentage of the square is . . .
What is the sum of the interior angles B and D of the pentagon if three other . . .
If I picked three red points, each in the middle of a different side of the big . . .
A large rectangle of perimeter 44 is divided into 10 congruent rectangles. . . .
Find the area of the shaded region (in square units).
Five percent of the marbles in a jar are black. One fourth of the marbles . . .
A bag contains 6 green, 5 gray, and 4 violet disks. If 2 disks are drawn at . . .
If two dice are rolled 72 times, how many times is the sum of the two top . . .
A city hall contains 165 chairs. The first row has 10 chairs. Each additional . . .
Which number could be removed from the set without changing the average . . .
The first person is 100 cm tall. Each next person is 20% taller than the . . .
Five students put their sandwiches into five paper bags. The bags are . . .
Four kinds of apples are combined in a box. I select apples from the box . . .
Alex received a 70 on his essay and a 90 on his final. He got an 80 on class . . .
Statistics show that for every 100 babies born in Funny Town, there are 10 more . . .
John arrives at crossroads A from the North. He makes four moves each time . . .
99 numbers have an average of 101. Ninety of these numbers have an average of . . .
The average of a set of 12 numbers is 1. If 18, 50 and -20 are added to the . . .
Anna has a bag with 90 wafers. She eats 14 wafers on the first day. Every . . .
Bobby takes five tiles with the letters of his name and places them into a bag. . . .
Six standard dice are rolled and the numbers on the top faces are added . . .
Two princes and two princesses are ready to marry. Everybody independently . . .
The sum of N consecutive integer numbers is 2090. The smallest number is 101. . . .
I have eight dimes; five are real, and three are fake. Whenever a real dime is . . .
A team of three children, Anna, Bill and Cindy, independently answers . . .
Dueling Idiots Problem: three idiots participate in a duel. They shoot at the . . .
There are 10 girls and 10 boys in a class. A teacher randomly chooses two . . .
Two dice are thrown. You can see all 12 numbers except 2 faces that are on the . . .
A chip is placed at the bottom left corner square of a 5 x 5 grid. The chip is . . .
After a gun is fired in a saloon, 75% of the cowboys have a wounded ear, 80% . . .
If we set out by ranks of 10, we will be one short. We will also be one short . . .
It takes 2 cards to build 1 floor of a card house. It takes 7 cards to build . . .
Anna earned an average of 80% on her four exams. If she never earned more . . .
What is the average of the smaller of two random numbers from 0 to 1?
John answered 100 4-option multiple-choice questions. He is sure that he . . .
Forty non-zero positive numbers are written in a row. The average of the . . .
This picture shows the first five rows of Pascal's triangle. What is the sum . . .
San Jose Scrabblereg; Club No. 21 published a three-letter word list that . . .
In a city, there were seven bridges. There was a tradition to walk and cross . . .
An entrepreneur wants to hire the best person for a position. He makes a . . .
A group of kids with dogs go for a walk. There are 49 feet and heads . . .
Bob is rolling two dice and will subtract the second number from the first . . .
The average of twelve numbers is 8 and the average of another set of eight . . .
Fifteen numbers have an average of 10. Five of these numbers have an average . . .
The average (arithmetic mean) of a set of 10 different numbers is 98. If the . . .
Anna has 3 bags of marbles. The first contains 5 white marbles and 5 green . . .
John has an average of 87 on his two math exams. To earn an A, he must have a . . .
I roll two dice. What is the probability that the two numbers are equal?
Everyone in tenth grade classes voted on a motion. Sixty percent of the girls . . .
Alex received a 60 on his essay and an 80 on his final. He got a 90 on class . . .
Gerry and Jane are younger than 25. The probability that two randomly chosen . . .
Jane and Gerry visit a casino. In one game, they have a 1/5 probability of . . .
John is sick 12 days per year. The probability of being sick on a Saturday or . . .
Abbey has a dog Abby. She places 5 tiles with the letters of her surname into . . .
John sent an email to his three partners. Everybody answered and copied the . . .
An average baby is about 20 inches (51 cm) long and weighs approximately 6 to 9 . . .
The binary numeral system represents numeric values using two symbols: 0 and 1. . . .
0 2 6 12 20 . . . What is the 100th number in the series?
If 2 salesmen can sell three luxury cars in 4 days, how many luxury cars can . . .
If you are a redhead you have more than the average amount of hair. This . . .
If the probability of an accident occurring in 4 years is 0.9999, what is the . . .
Find the sum of the series: 1/2 + 1/4 + 1/8 + 1/16 + . . .
Alex(A), Beatrice (B), and Craig (C) work on a project. (1) Together, A and . . .
I ask you to pick a number from 1 to 100. I then ask you, “Is the number . . .
Guesstimation A man can jump up to four times the length of his own body. . . .
Alex must match three different numbers chosen from the integers 1 to 33 in any . . .
In the United States, the average life span is 65 years and the average female . . .
What is the average of all positive integers less than 100 that are multiples . . .
Which year has had the greatest number of Roman numerals in it?
Which result ends in exactly seven zeroes. Remember: N! = 1 x 2 x . . . x N
After a test of a code, John detected 2 errors and Mary discovered 3 errors in . . .
John and Mary have equal chances of winning. What is more probable?
After a 20% discount and 8% tax, a set of tin solders costs $540. What was . . .
Every day, a stock price of $444 is either increased or decreased by 4%. When . . .
One bag contains two white marbles, another bag contains two black marbles, and . . .
A school offers the following dinner choices: First course: soup or small . . .
The average IQ of 100 students is 101. If the first ninety-nine students each . . .
Anna spent 120 Swiss francs in a Swiss souvenir shop. She was charged an extra . . .
What is the probability of getting blue?
What is the probability of not getting blue in two runs?
If the first President of the USA George Washington took office in 1789 and the . . .
Javier Sotomayor (Cuba) is the men's record holder with a jump of 2.45 m set . . .
Bob used to weigh 100kg. His new stressful job causes him to lose 10% every . . .
How many 9s are there in the result of the multiplication: 12345 x 99999 ? . . .
John's family tree includes 10 generations. What is the minimum number of . . .
A line containing 9 keyboard letters on Gerry's laptop does not work. If his . . .
Gerry estimates that two angles of a triangles have a measure between 50 and 70 . . .
What is the difference between 11 in decimal (normal) and binary systems? A . . .
What time is it 1234 minutes after 1:23 a.m.?
There are 800 students in a school. The students' average age is 12 years and . . .
How many times do you expect to get 5 if you throw a die 55 times?
If you toss a dime five times and it lands heads up three times, what are the . . .
2 + 2 = 11 In what numeral system is the expression true?
The masses of sugar and water in my 200 g tea cup are in the ratio 1 : 9. If . . .
Which of the following could be the percentage of even numbers among several . . .
What is the sum? 2001 + 2002 + . . . + 2099
The cost of living increases uniformly by 44% in a period of two years. What . . .
If I roll two dice, what is the probability of rolling a six on at least one of . . .
You are rolling two dice and adding the numbers on the top faces. What sum . . .
What is the sum of the first 13 numbers that are evenly divisible by 13?
Gerry and Jane like to look at registration plates of cars that pass by. They . . .
If I put these balls in a bag and take two balls without looking, what is the . . .
I roll two dice, one with the left hand and one with the right. If the left . . .
Buy 2 for the price of 3 and get 50% off!
What is the final rebate do . . .
The pie chart shows the number of men, women and kids in a county. What is . . .
Gerry tosses a coin and Jane tosses 2 coins. What is the probability that . . .
Martin has ten thousand dollars in a bank account. The interest rate for his . . .
Jane and Gerry compete in a best-of-three match. If Gerry plays so that his . . .
Cletus is absolutely, definitely, the worst student the driving school has ever . . .
In what numeral system is the phrase correct?
1 + 1 = 10
Leslie Green asks: quot;In a large village community there are regularly women . . .
Jane has a 5-liter bucket with 5%-fat milk and 3-liter bucket with 3%-fat . . .
Anton, the highest IQ house ant on the planet, is taking his regular nocturnal . . .
Jake, being bored on a rainy Sunday afternoon, throws a pair of dice 500 times . . .
An escaped criminal has stolen a spaceship, and has just instantaneously jumped . . .
Despite advice to the contrary from his friends and parents, Timmy has decided . . .
Jane has three parrots. She said that at least one is a boy. What is the . . .
Lottery 6-digit numbers are from 000001 to 999999. A ticket is considered to . . .
What are the odds of getting at least two tails in a row if you flip a dime . . .
Which of the following is closest to 123456789 x 987654321
What is the probability of getting 5 correct answers on A+Click questions in a . . .
One hundred workers complete a project in 100 working days. Adding any . . .
A recipe to make a cake for 66 people uses 3333 grams of sugar. How much . . .
The price of a T-shirt on sale is $19.99. The store reduced the original . . .
Tom drives for 3 days. On the second day he drives 2 km more than a quarter . . .
Anna's income is seven-eighths that of Beatrice. Anna's expenses are . . .
Anna wants to score exactly 33 points. The ducks give different points. How . . .
The diagram shows some of the results of a six-person contest. There are two . . .
Jane and Gerry are playing a card game. Without looking, a card is drawn from . . .
Find the number evenly divisible by 2, 3, 4 and 5.
How many times do the hour and the minute hands form a 90-degree angle in the . . .
John read a 165-page book in 11 days. Every day, he read 1 page more than the . . .
The left 11-tooth gear turns at 124 revolutions per minute. The middle gear . . .
The first six numbers in a sequence are shown on the right. What is the 66th . . .
A class of 44 students is divided into 4 groups. Each group contains at least . . .
The number 99! is very big. How many zeros are there at the end of the . . .
How many years ago did you have more than one thousand ancestors? Assume . . .
What is the sum of 99 consecutive integers, if a third of them are negative . . .
There is a set of 9 numbers: 1,2,3,4,5,6,7,8,9. Five numbers are selected from . . .
I arrange five marbles randomly in a ring. There are two green and three . . .
A girl was born in the 20th century. Take away from her year of birth the sum . . .
The matchsticks make a spiral that goes clockwise. How many matchsticks do I . . .
The figure shows a triangle made of discs. I want to move the discs and turn . . .
Two rectangles enclose five regions. Find 2 figures that can form the . . .
A password consists of five digits, 0-9. How many passwords are there that . . .
Yellow Taxi Service charges $1.20 for the first mile and $.79 for each . . .
An integer consists of 2010 digits such that any consecutive 10 digits are . . .
Twelve couples met at a party. Each person shook the hand of each of the . . .
There are 24 balls in the box. X of them are white. When we add 12 white . . .
There are four brothers in a family. The sums of the ages of three of them are . . .
Bill buys oranges at five for $1 and sells at one for $5. How many oranges . . .
I have apples and paper boxes. If I place 8 apples into each box, I will have . . .
What is the probability that the next person you meet is George Washington, the . . .
It takes two painters 4 days to paint a house. The older painter would only . . .
In how many ways can the name ALEX be spelt out, using adjacent letters of the . . .
Find the missing figure.
Which shape fits in the missing space to complete the pattern?
I wrote all the numbers from 0 to 999. Which digit did I write less than the . . .
Two apples and two peppers have the same weight as three eggs. Six eggs and . . .
A group of gentlemen visited a produce shop. Each gentleman bought the same . . .
I must balance any whole number load from 1kg to 40kg using these four weights . . .
Based on 20 years per generation, estimate the number of ancestors John has in . . .
A kitten has a 50/50 chance to be male or female. My cat just delivered two . . .
I sold two cars and received sixty thousand dollars for each car. I received . . .
What is the largest digit in the product of 11111111 x 11111111 ?
Every year on my son's birthday, I put multiples of one thousand dollars in his . . .
Sixty-five students want to share 15 melons. They decide that four boys will . . .
How old is the eldest of these four sisters if the product of their ages is 792?
Bill (B), Cindy (C), and Daniel (D) work on a project. (1) Together, B and C . . .
Find the odd one out.
A magician placed 3 bowls of fruit in 3 closed boxes and 10 people tried to . . .
It takes exactly 1 hour to burn a rope when I light one of its ends. The rate . . .
Logic puzzle: What number comes next after 66?
Three identical glasses contain orange juice. The first one is 15% full, the . . .
What is the sum of 101 consecutive positive integers if the middle one is n?
Many people stand in a line (queue) to buy tickets to a match. There are . . .
In the first week John made $1. He made 4 times more than the previous week if . . .
How many two-digit integers are there in which the sum of the digits is equal . . .
Twenty years ago, Bob was four times as old as Anna. Today, he is twice as old . . .
Twelve European teams enter a football tournament. Each team plays one match . . .
Anna traveled 3600 miles in a car. She had five tires and changed them such . . .
On January 1st, Anna and Bill have $55 each. Each month Anna saves $5 more . . .
Anna bought 1 slice of mushroom pizza and 2 slices of cheese pizza for a total . . .
There are a number of apples, all of different weights. The 10 lightest apples . . .
John has just had a 1% pay rise. He used to earn $5000 a month. He told his . . .
Multiply all positive numbers below 33. How many zeros are there at the end . . .
Logic puzzle: a secret door. A man approached the door of a secret . . .
The figure shows a triangle made of discs. I want to move two discs and turn . . .
What is half of two plus two minus two? How many possible answers are there . . .
Logic riddle: In a house, there are three switches on the ground floor and a . . .
What is the next number in the following sequence? 1 11 101 111 ?
Anna, Beatrice, and Cindy run a 1000-meter race. All of them run at a . . .
Brett, Cindy, and Daniel each launch a 100-day project. On day 100, Brett . . .
At a party 60% of the boys are dancing with 90% of the girls. How many . . .
There were nine knights in a kingdom and enough hay to feed their horses for . . .
Find a sentence that is true.
If you rearrange the letters NAMELESS, you would have the name of a
I take half of the coconuts plus a coconut. What percentage of coconuts is . . .
I want to measure exactly six minutes using only a five-minute hourglass and a . . .
A series of 10 books were published at one-year intervals. The sum of the . . .
How many "yes or no" questions are needed to guess any 3-digit lock code?
Five pirates capture some treasure. They divide the coins and find that there . . .
Find the number.
What would you choose if you were hungry?
There are four new projects in a company. The sums of the budgets of three of . . .
A rich man is saving for a new car. He sets up an automatic transfer of $1000 . . .
Three years ago there were 32 people in our company, and the ratio of men to . . .
A 40-month long project is divided into three consecutive activities. The . . .
A leading supplier left a solar plant project seven months after the project . . .
In a test of 50 questions, the final score is calculated by subtracting three . . .
Greg takes 100-point tests. He wants to achieve an average grade of at least . . .
If I place a pair of brackets in to this number expression, what result can be . . .
The theory of relativity connects the mass at high speed with initial mass, the . . .
Gerry lives 50 miles away from Jane. He drives to Jane's house at 60 miles . . .
A math test has 40 questions worth 100 points. The test consists of . . .
What is the word coiled inside this circle?
Gerry bought 3 oranges and 8 apples for $5. The next week he bought 8 oranges . . .
Guess!
Three positive whole numbers have the same answer added together or when . . .
In a village, there are 100 families with either one child or none. This is a . . .
We need 200 tons of such stones to pave a city square. How much stone do we . . .
Find the odd one out.
A grocery store lowered the price of coconuts from 49 cents to 48 cents. For . . .
The product of two numbers is 119 and their difference is 10. What is the sum . . .
A third of 8 is $4. Based on that proportion, what is one-fifth of 6?
Zac's number is 5. Anna's number is 6. Bill’s number is 7. What is . . .
300 plus 150 and 300 minus X is the same thing. What is X?
When Pinocchio lies, his nose gets twice as long. When he tells the truth, his . . .
What letter goes next? A E F H I K L M N
In a room, there are 3 bosses, 2 wives, and a plumber. What is the least . . .
Sammy the sea lion has spotted a gorgeous Lady sea lion before anyone else. She . . .
A certain Professor of Statistics is trying to explain to his grandson that . . .
Three observers, not more than 1km apart on flat windless terrain, report the . . .
There are three goddesses named Mendax, Fidelis and Furtibus; one on your left, . . .
One invention saves 20% on fuel; a second, 30%; and a third, 50%. If the . . .
The ratio of women to men at a 100-employee company is 1 : 4. The company . . .
On an European island, 18 are kids, 28 are divorced, 38 are married, and the . . .
Leslie Green asks: Peter changes his old fashioned single 100W incandescent . . .
A shopkeeper purchased 300 bulbs for $0.95 each. However, every . . .
Leslie Green asks: quot;My neighbor Timmy has developed a complicated set of . . .
What is the main difference between the pictures on the left page and on the . . .
What is the main difference between the pictures on the left page and on the . . .
Mensa question: 19 28 37 . . . How many more numbers are . . .
At Wal-Mart, CDs cost $0.50 per disk, and pens cost $1.00 each. Which . . .
A father wishes to divide a square piece of land among his five sons. He . . .
John's dad pays him $8 for each correct answer he gives in his math homework . . .
Bob is looking for a new job. He has three offers with the same starting . . .
Bob will work 5 days. Which payment plan should he choose?
A restaurant sells a 30 cm (in diameter) pizza for $9, while their large 40 cm . . .
A real estate agent receives a 5% commission on the selling price of a house . . .
The traveling salesman problem: a salesman has to visit eight towns and return . . .
Blind people use a special method to read texts. The method was invented by . . .
I use a room that is 7 x 11 to arrange five boxes. I would like to move the . . .
I placed seven balls into a square box. Is it possible to rearrange the balls . . .
Brad is framing a small flower box by four rectangular bricks. Each of the . . .
Yesterday, I caught 30 fish of a certain size in a pond. I marked and . . .
Estimate the area of the lake shown on the right.
In a casino on a Sunday, 90% of the visitors lost $100 each, 9% of the . . .
Several plumbers work on a pipeline installation, which 1 plumber is able to . . .
John works on a 12-month project. Forty percent of the first 3-month activity . . .
A project manager needs a car 3 days per week. The daily cost of car renting . . .
The average hourly wages of men and women in company A are $21 and $16, . . .
In an investment club, 90% of the members bought stock in company A, 80% . . .
If 9 workers can build 9 houses in 9 months, then how many months would it . . .
Jim sells 60 percent of pineapples he had and throws away 10 percent of the . . .
A space rocket has a critical fuel system, protected by 4 independent safety . . .
A city hall floor is to be tiled in the following pattern. The hall measures . . .
It costs $24 to paint a cube. Before painting, it was cut in four pieces by . . .
A full box with 70 matches weighs the same as four boxes with 10 matches each. . . .
If 5% of the people get 95% of the total salary paid in a county, and the . . .
Anna can complete a project in 40 days. Bill can complete the project in 50 . . .
I want to construct a solid brick from wooden cubes. Its side ratio is 1 : 2 . . .
There are 8 people in a village. They consume 8 coconuts altogether. Each . . .
Inspired by Morozkin's problem : Two children started at 6:00 and each . . .
Anna and Bill roll a six-sided die. The first person to roll a six wins. Anna . . .
The picture shows the rectangular floor plan of the first level of a house. . . .
I am placing round beads: 1 blue and 1 red; then 2 blue and 2 red; then 3 blue . . .
The rear tires of my car wear out after 60,000 miles, whilst the front tires . . .
80% of the women in company A are under 25 years old, 40% of the men in the . . .
If Mark had driven at 6 miles per hour (mph) faster than the state speed limit . . .
Since the day he was born, Bill's parents have put $1000 in his bank account . . .
John sees the reflection of the treetop in a mirror. Find the height of the . . .
In selling stock, John made a profit of 19% of the amount originally paid for . . .
The size of an NBA basketball court is about 29 by 16 meters. How many . . .
Find X.
The population density of the Italian capital Rome is about 2,000 people per . . .
Each week, Mrs. Smith gives her students as many worksheets as their age. For . . .
Jane pedaled downhill at 20 km/h (kilometers per hour) and it took 2 hours to . . .
If a real estate agent received $60,000 as a 5% commission on the selling price . . .
How much paint do you need to paint the pyramid if you need 1kg for 1 square . . .
A district sends, on average, a total of 200 million gallons of water each . . .
Gerry was born at 11:55 P.M. on December 31, 2000. Jane was born 6 minutes . . .
Steve says that he will be X years old in year X
2
. What will be . . .
Anna (A), Bill (B), Cindy (C), and Daniel (D) work on a project. (1) . . .
The picture shows a composite structure under stress. Estimate the percentage . . .
Computer Update Problem
suggested by Leslie Green I spot a computer . . .
A plastic ruler is much easier to bend in one direction than another according . . .
Leslie Green asks: Income tax is a strange concept when inflation is taken . . .
Leslie Green, Oxfordshire, UK, asks: quot;My neighbor a famous Professor of . . .
Bob worked for 45 years. He did not work on weekends, had a 3-week summer . . .
There are two gods named Mendax and Fidelis, one on your left, the other on . . .
An elephant weighing 2 tonnes (2 metric tons) and a rabbit weighing 1kg are . . .
If $1 equals 0.9 Euros, $1 equals 1.02 Swiss francs, and 1 euro equals 9.5 . . .
The ratio of women to men at a 100-employee company is 1 : 4. The company . . .
Sasha is learning about Archimedes at school. His show-off sister is 3 years . . .
The largest denomination of currency ever printed by the Bureau of Engraving . . .
Leslie Green asks: Engineers need to use quantities which can vary over at . . .
The boss of a 10 person company is always the last to arrive, and gets the . . .
If you push a finger through the Earth in the British capital London, where . . .
There’s a tennis tournament with one hundred players. How many rounds does . . .
One hundred workers complete a project in 100 working days. Adding ten more . . .
The speed of light is 3 x 105 kilometers/second. If the sun is . . .
The North American emergency telephone number is 911. How many three-digit . . .
Choose the answer without using a calculator. Which number is evenly . . .
How many sets of at least two consecutive positive integers have a sum of 15?
What is the sum of all the digits (not numbers) in the sequence 1, 2, 3, 4, . . . . .
The date July 31, 1370 in MM/DD/YYYY format is a palindrome that may be read . . .
Make 33 by using three 3s and any math operators. How many times do you use . . .
The sum of two prime numbers is equal to 888. There are several options. We . . .
The last digit of the number 9100 is 
The typical healthy resting heart rate in adults is 60–80 beats per minute. . . .
Pairs of primes separated by a single number are called prime pairs. Examples . . .
Which is not correct? Remember that 3! = 1 x 2 x 3
You can throw an unlimited number of darts at the dartboard. Some total . . .
The sum of the digits of a four-digit number is 15. All the digits are . . .
Simplify the expression 12(3 + x) – 4(5x – 6).
In the equation y = 9x2 – 1, which is the value of x when y = . . .
Simplify
What transformation creates an image with a vertex at the origin?
What relation goes through points A, B and C?
Which point would be on a line passing through C and perpendicular to the line . . .
Between what two whole numbers does the result lie?
A is the set of all points (x,y) in the shaded region. Find the set . . .
Which of the following graphs represents all values of x such that 
The last digit of the number 333 is:
Which of the following could be a value of x?
A perfect cube is an integer whose cube root is an integer. For example, 64 . . .
2 + 2 = 5 Find an error in the proof.
Find the expression that is INCORRECT.
Find the value of F, if a = 0.2.
Eugenia used 192 digits to number the pages in her diary. How many pages . . .
Which of the following gives the largest value?
Do these rays have one point of intersection? If yes, find the x-coordinate . . .
What is the largest product of positive integers that add up to 17?
Identify the location of point E after the transformation (x 2 + 4, . . .
Which point is on the axis of symmetry of the graph of the parabola?
Xia and Yvonne collect buttons. Xia only collects the ones with two holes and . . .
Nine teams enter a basketball tournament. Each team plays one match against . . .
A frog ate 20 flies in a day. Each day, the frog ate 20 more than on the day . . .
If the admittance rate to a prestigious university is 7.5% and 810 students . . .
Mr. Rapid always starts driving on a motorway at exactly 7:00 a.m.
If he . . .
In a city, three-quarters of the men are married to four-fifths of the women. . . .
Ben ate 100 bananas between Monday and Friday, stopping for the weekend. . . .
On an island, the ratio between the number of adult men and the number of adult . . .
It takes two gardeners 6 days to mow a lawn. One is lazy and one is . . .
Derek dragon became a vegetarian two years ago. Derek likes to eat 3 baskets . . .
Find the ratio of the green and blue areas y = x2. 
Two trains start at the same time, one from Zurich to Lausanne, the other from . . .
A rectangle has a width of 0.3x and a length of 0.4x. Which formula is the . . .
An arrow rotates 366° in one second. How many revolutions does it make in . . .
Two satellites orbit at 1/4 R above Earth's surface. R is the radius of the . . .
A mathematician wants to approximate the width of a lake. He places 5 markers . . .
What is the area of the colored shape?
Angles A and C are equal to 90o. Which proportion is true?
Each interior angle of a regular polygon measures 144o. How many . . .
A square garden is 401 square meters. The minimum distance between apple . . .
If the Earth's radius is twice the radius of planet M, then how much bigger is . . .
A boy is making boxes from cardboard. He is going to cut square pieces off . . .
Alex wants to arrange the cylinders from least to greatest volume. What is . . .
Which shape would be made if the two sections were fitted together?
Five boys Andrew, Brandon, Chris, Daniel, and Ethan live on State Street. At . . .
A boy cuts a cardboard circle and only cuts 5 straight lines. He does not . . .
How many planes of symmetry does a cube have?
How many boxes measuring 0.1m x 0.1m x 6.9m can be packed into a container . . .
The figure shows a pyramid made of small squares. I want to move the small . . .
The American flag consists of thirteen equally spaced, horizontal red and white . . .
The figure shows a regular pentagon. Compare the values of angles A and B.
Divide the analog watch face with two straight lines so that the sums of the . . .
Look at the mini-golf course. To what point would the player hit the golf . . .
How many interior right angles are possible in a polygon with seven sides? 
Bill mows the front lawn, which is a 7m by 10m rectangle. The mower cuts a 1m . . .
A block of wood in the form of a cuboid 9 x 10 x 11 has all its six faces . . .
I fold a square piece of paper in half four times without unfolding, making an . . .
How many squares can be formed by joining four of these points on the . . .
If I tile a floor with 3000 regular hexagonal tiles as shown here how many . . .
Path C consists of straight segments. Path D and E consist of semi-circles. . . .
A circle is drawn through two vertices of a square so that it is tangent to . . .
I placed together four identical triangles and the square, without overlaps, to . . .
Compare areas F and G 
What is the sum of the marked angles?
Eight points are equally spaced on a circle. How many right angled triangles . . .
The picture shows six equilateral triangles. The sides of the triangles are . . .
The picture shows a tiling pattern which is made of square green tiles 10 x 10 . . .
Fifteen billiard balls perfectly fit into a triangular rack. What is the . . .
What is the smallest number of segments that needs to be moved so that the . . .
All three circles are tangent to the horizontal line and to one another. The . . .
A girl wants to cut the paper into several equal pieces of the same shape, and . . .
Two lines and two diagonals are drawn through the center of the rectangle. . . .
How many circles are needed to separate each star from all of the others?
I would like to cut the shape into the fewest possible pieces that will fit . . .
The colored figure in the picture consists of isosceles right triangles. . . .
The vertices of the smaller square divide each side of the larger square by a . . .
I blew some air into a spherical balloon and quadrupled its surface area (4 . . .
Estimate the area of the largest equilateral triangle that can fit within a 1x1 . . .
Four matchsticks form a square. How many non-overlapping squares can be . . .
Guesstimation. How many tennis balls can fit in a school bus?
I arranged twelve one-inch wooden sticks in a polygon with an area of 6 square . . .
Anna has made puzzle pieces by cutting wedges from a disk. Each wedge cut from . . .
How many coins do I need to melt down and recast to get a single coin of double . . .
Shape A and B are congruent equilateral triangles. Shape C is formed by . . .
The diagram illustrates a row of three squares formed by matches. How many . . .
A boy stacked colored cubes in a square pyramid like the one shown here. The . . .
The figure shows a red equilateral triangle inscribed within another . . .
The three circles have fixed centers, and the diameter of a circle is 7 / 8 of . . .
For this rectangular solid, which plane(s) contain(s) C and is/are parallel to . . .
Two similar pyramids have volumes of 343 m3 and 64 m3. . . .
Which triangle with sides a, b, and c has the largest area?
Squares 1, 2 and 3 have sides of length 1, 2 and 3 units, respectively. What . . .
A square with a side length 20 has two vertices on the circle, and one side . . .
Two squares, each with sides measuring 2 cm, are placed such that a vertex of . . .
A recipe makes 5 pizzas that are 12 inches in diameter. If I decide to make . . .
Two congruent circles share a radius. What is the perimeter of the figure . . .
What is the area of a garden? 
The large and small circles touch each other. What part of the large circle . . .
Estimate how long the rope is if its diameter is 1 cm.
Find the ratio of the areas of the large and small squares.
What is the largest possible side size of an equilateral triangle that fits . . .
The hypotenuse of a right triangle is 6, and the length of one leg is 2 units . . .
What part of the rectangle is red if points A and B are the midpoints of the . . .
How many lines can be drawn in a plane so that they are equidistant from 3 . . .
Three overlapping squares form 5 squares including themselves in the picture. . . .
You have a 5kg weight and a 12kg weight. They are the same height and are . . .
Estimate the maximum number of smaller 1-inch circles that fit in a larger . . .
What is the volume in cubic inches of the pyramid with height 10 inches? The . . .
I want to divide this shape into four congruent pieces - all of precisely the . . .
Which pyramid has the largest volume?
Find the area of the colored rectangle.
Which line goes through the center of the circle?
All sides of the white cross are the same. What percentage of the square is . . .
What is the sum of the interior angles B and D of the pentagon if three other . . .
If I picked three red points, each in the middle of a different side of the big . . .
A large rectangle of perimeter 44 is divided into 10 congruent rectangles. . . .
Find the area of the shaded region (in square units).
Five percent of the marbles in a jar are black. One fourth of the marbles . . .
A bag contains 6 green, 5 gray, and 4 violet disks. If 2 disks are drawn at . . .
If two dice are rolled 72 times, how many times is the sum of the two top . . .
A city hall contains 165 chairs. The first row has 10 chairs. Each additional . . .
Which number could be removed from the set without changing the average . . .
The first person is 100 cm tall. Each next person is 20% taller than the . . .
Five students put their sandwiches into five paper bags. The bags are . . .
Four kinds of apples are combined in a box. I select apples from the box . . .
Statistics show that for every 100 babies born in Funny Town, there are 10 more . . .
John arrives at crossroads A from the North. He makes four moves each time . . .
99 numbers have an average of 101. Ninety of these numbers have an average of . . .
The average of a set of 12 numbers is 1. If 18, 50 and -20 are added to the . . .
Anna has a bag with 90 wafers. She eats 14 wafers on the first day. Every . . .
Bobby takes five tiles with the letters of his name and places them into a bag. . . .
Six standard dice are rolled and the numbers on the top faces are added . . .
Two princes and two princesses are ready to marry. Everybody independently . . .
The sum of N consecutive integer numbers is 2090. The smallest number is 101. . . .
I have eight dimes; five are real, and three are fake. Whenever a real dime is . . .
Dueling Idiots Problem: three idiots participate in a duel. They shoot at the . . .
There are 10 girls and 10 boys in a class. A teacher randomly chooses two . . .
A chip is placed at the bottom left corner square of a 5 x 5 grid. The chip is . . .
After a gun is fired in a saloon, 75% of the cowboys have a wounded ear, 80% . . .
It takes 2 cards to build 1 floor of a card house. It takes 7 cards to build . . .
Anna earned an average of 80% on her four exams. If she never earned more . . .
What is the average of the smaller of two random numbers from 0 to 1?
This picture shows the first five rows of Pascal's triangle. What is the sum . . .
San Jose Scrabblereg; Club No. 21 published a three-letter word list that . . .
In a city, there were seven bridges. There was a tradition to walk and cross . . .
An entrepreneur wants to hire the best person for a position. He makes a . . .
A group of kids with dogs go for a walk. There are 49 feet and heads . . .
The average (arithmetic mean) of a set of 10 different numbers is 98. If the . . .
Everyone in tenth grade classes voted on a motion. Sixty percent of the girls . . .
Jane and Gerry visit a casino. In one game, they have a 1/5 probability of . . .
John is sick 12 days per year. The probability of being sick on a Saturday or . . .
Abbey has a dog Abby. She places 5 tiles with the letters of her surname into . . .
John sent an email to his three partners. Everybody answered and copied the . . .
The binary numeral system represents numeric values using two symbols: 0 and 1. . . .
If you are a redhead you have more than the average amount of hair. This . . .
If the probability of an accident occurring in 4 years is 0.9999, what is the . . .
Alex(A), Beatrice (B), and Craig (C) work on a project. (1) Together, A and . . .
I ask you to pick a number from 1 to 100. I then ask you, “Is the number . . .
Alex must match three different numbers chosen from the integers 1 to 33 in any . . .
Which year has had the greatest number of Roman numerals in it?
After a test of a code, John detected 2 errors and Mary discovered 3 errors in . . .
John and Mary have equal chances of winning. What is more probable? 
After a 20% discount and 8% tax, a set of tin solders costs $540. What was . . .
Every day, a stock price of $444 is either increased or decreased by 4%. When . . .
One bag contains two white marbles, another bag contains two black marbles, and . . .
A school offers the following dinner choices: First course: soup or small . . .
The average IQ of 100 students is 101. If the first ninety-nine students each . . .
Anna spent 120 Swiss francs in a Swiss souvenir shop. She was charged an extra . . .
What is the probability of getting blue?
If the first President of the USA George Washington took office in 1789 and the . . .
Javier Sotomayor (Cuba) is the men's record holder with a jump of 2.45 m set . . .
Bob used to weigh 100kg. His new stressful job causes him to lose 10% every . . .
John's family tree includes 10 generations. What is the minimum number of . . .
A line containing 9 keyboard letters on Gerry's laptop does not work. If his . . .
Gerry estimates that two angles of a triangles have a measure between 50 and 70 . . .
There are 800 students in a school. The students' average age is 12 years and . . .
If you toss a dime five times and it lands heads up three times, what are the . . .
The masses of sugar and water in my 200 g tea cup are in the ratio 1 : 9. If . . .
The cost of living increases uniformly by 44% in a period of two years. What . . .
What is the sum of the first 13 numbers that are evenly divisible by 13?
Gerry and Jane like to look at registration plates of cars that pass by. They . . .
If I put these balls in a bag and take two balls without looking, what is the . . .
I roll two dice, one with the left hand and one with the right. If the left . . .
Buy 2 for the price of 3 and get 50% off! What is the final rebate do . . .
The pie chart shows the number of men, women and kids in a county. What is . . .
Gerry tosses a coin and Jane tosses 2 coins. What is the probability that . . .
Martin has ten thousand dollars in a bank account. The interest rate for his . . .
Cletus is absolutely, definitely, the worst student the driving school has ever . . .
Leslie Green asks: quot;In a large village community there are regularly women . . .
Jane has a 5-liter bucket with 5%-fat milk and 3-liter bucket with 3%-fat . . .
Anton, the highest IQ house ant on the planet, is taking his regular nocturnal . . .
An escaped criminal has stolen a spaceship, and has just instantaneously jumped . . .
Despite advice to the contrary from his friends and parents, Timmy has decided . . .
Jane has three parrots. She said that at least one is a boy. What is the . . .
Lottery 6-digit numbers are from 000001 to 999999. A ticket is considered to . . .
Which of the following is closest to
123456789 x 987654321
One hundred workers complete a project in 100 working days. Adding any . . .
A recipe to make a cake for 66 people uses 3333 grams of sugar. How much . . .
The price of a T-shirt on sale is $19.99. The store reduced the original . . .
Tom drives for 3 days. On the second day he drives 2 km more than a quarter . . .
Anna's income is seven-eighths that of Beatrice. Anna's expenses are . . .
Anna wants to score exactly 33 points. The ducks give different points. How . . .
The diagram shows some of the results of a six-person contest. There are two . . .
Find the number evenly divisible by 2, 3, 4 and 5.
How many times do the hour and the minute hands form a 90-degree angle in the . . .
John read a 165-page book in 11 days. Every day, he read 1 page more than the . . .
The left 11-tooth gear turns at 124 revolutions per minute. The middle gear . . .
The first six numbers in a sequence are shown on the right. What is the 66th . . .
A class of 44 students is divided into 4 groups. Each group contains at least . . .
The number 99! is very big. How many zeros are there at the end of the . . .
What is the sum of 99 consecutive integers, if a third of them are negative . . .
I arrange five marbles randomly in a ring. There are two green and three . . .
A girl was born in the 20th century. Take away from her year of birth the sum . . .
The matchsticks make a spiral that goes clockwise. How many matchsticks do I . . .
The figure shows a triangle made of discs. I want to move the discs and turn . . .
Two rectangles enclose five regions. Find 2 figures that can form the . . .
Yellow Taxi Service charges $1.20 for the first mile and $.79 for each . . .
Twelve couples met at a party. Each person shook the hand of each of the . . .
There are 24 balls in the box. X of them are white. When we add 12 white . . .
There are four brothers in a family. The sums of the ages of three of them are . . .
Bill buys oranges at five for $1 and sells at one for $5. How many oranges . . .
I have apples and paper boxes. If I place 8 apples into each box, I will have . . .
It takes two painters 4 days to paint a house. The older painter would only . . .
In how many ways can the name ALEX be spelt out, using adjacent letters of the . . .
Find the missing figure.
Which shape fits in the missing space to complete the pattern?
I wrote all the numbers from 0 to 999. Which digit did I write less than the . . .
Two apples and two peppers have the same weight as three eggs. Six eggs and . . .
A group of gentlemen visited a produce shop. Each gentleman bought the same . . .
I must balance any whole number load from 1kg to 40kg using these four weights . . .
A kitten has a 50/50 chance to be male or female. My cat just delivered two . . .
Sixty-five students want to share 15 melons. They decide that four boys will . . .
How old is the eldest of these four sisters if the product of their ages is 792?
A magician placed 3 bowls of fruit in 3 closed boxes and 10 people tried to . . .
It takes exactly 1 hour to burn a rope when I light one of its ends. The rate . . .
Logic puzzle: What number comes next after 66?
Three identical glasses contain orange juice. The first one is 15% full, the . . .
What is the sum of 101 consecutive positive integers if the middle one is n? 
Many people stand in a line (queue) to buy tickets to a match. There are . . .
In the first week John made $1. He made 4 times more than the previous week if . . .
Twenty years ago, Bob was four times as old as Anna. Today, he is twice as old . . .
There are a number of apples, all of different weights. The 10 lightest apples . . .
John has just had a 1% pay rise. He used to earn $5000 a month. He told his . . .
Multiply all positive numbers below 33. How many zeros are there at the end . . .
The figure shows a triangle made of discs. I want to move two discs and turn . . .
Logic riddle: In a house, there are three switches on the ground floor and a . . .
What is the next number in the following sequence? 1 11 101 111 ?
Anna, Beatrice, and Cindy run a 1000-meter race. All of them run at a . . .
At a party 60% of the boys are dancing with 90% of the girls. How many . . .
There were nine knights in a kingdom and enough hay to feed their horses for . . .
Find a sentence that is true.
I take half of the coconuts plus a coconut. What percentage of coconuts is . . .
I want to measure exactly six minutes using only a five-minute hourglass and a . . .
How many "yes or no" questions are needed to guess any 3-digit lock code?
Five pirates capture some treasure. They divide the coins and find that there . . .
Find the number.
A rich man is saving for a new car. He sets up an automatic transfer of $1000 . . .
A 40-month long project is divided into three consecutive activities. The . . .
A leading supplier left a solar plant project seven months after the project . . .
If I place a pair of brackets in to this number expression, what result can be . . .
The theory of relativity connects the mass at high speed with initial mass, the . . .
What is the word coiled inside this circle?
Gerry bought 3 oranges and 8 apples for $5. The next week he bought 8 oranges . . .
Guess!
We need 200 tons of such stones to pave a city square. How much stone do we . . .
A third of 8 is $4. Based on that proportion, what is one-fifth of 6?
When Pinocchio lies, his nose gets twice as long. When he tells the truth, his . . .
Sammy the sea lion has spotted a gorgeous Lady sea lion before anyone else. She . . .
A certain Professor of Statistics is trying to explain to his grandson that . . .
Three observers, not more than 1km apart on flat windless terrain, report the . . .
There are three goddesses named Mendax, Fidelis and Furtibus; one on your left, . . .
Leslie Green asks: Peter changes his old fashioned single 100W incandescent . . .
What is the main difference between the pictures on the left page and on the . . .
What is the main difference between the pictures on the left page and on the . . .
At Wal-Mart, CDs cost $0.50 per disk, and pens cost $1.00 each. Which . . .
A father wishes to divide a square piece of land among his five sons. He . . .
The traveling salesman problem: a salesman has to visit eight towns and return . . .
Blind people use a special method to read texts. The method was invented by . . .
I use a room that is 7 x 11 to arrange five boxes. I would like to move the . . .
I placed seven balls into a square box. Is it possible to rearrange the balls . . .
Brad is framing a small flower box by four rectangular bricks. Each of the . . .
Yesterday, I caught 30 fish of a certain size in a pond. I marked and . . .
Estimate the area of the lake shown on the right.
In a casino on a Sunday, 90% of the visitors lost $100 each, 9% of the . . .
John works on a 12-month project. Forty percent of the first 3-month activity . . .
A project manager needs a car 3 days per week. The daily cost of car renting . . .
The average hourly wages of men and women in company A are $21 and $16, . . .
Jim sells 60 percent of pineapples he had and throws away 10 percent of the . . .
A space rocket has a critical fuel system, protected by 4 independent safety . . .
A city hall floor is to be tiled in the following pattern. The hall measures . . .
It costs $24 to paint a cube. Before painting, it was cut in four pieces by . . .
A full box with 70 matches weighs the same as four boxes with 10 matches each. . . .
I want to construct a solid brick from wooden cubes. Its side ratio is 1 : 2 . . .
The picture shows the rectangular floor plan of the first level of a house. . . .
I am placing round beads: 1 blue and 1 red; then 2 blue and 2 red; then 3 blue . . .
80% of the women in company A are under 25 years old, 40% of the men in the . . .
Since the day he was born, Bill's parents have put $1000 in his bank account . . .
John sees the reflection of the treetop in a mirror. Find the height of the . . .
Find X.
The population density of the Italian capital Rome is about 2,000 people per . . .
Jane pedaled downhill at 20 km/h (kilometers per hour) and it took 2 hours to . . .
A district sends, on average, a total of 200 million gallons of water each . . .
Steve says that he will be X years old in year X2. What will be . . .
The picture shows a composite structure under stress. Estimate the percentage . . .
A plastic ruler is much easier to bend in one direction than another according . . .
Leslie Green asks: Income tax is a strange concept when inflation is taken . . .
Leslie Green, Oxfordshire, UK, asks: quot;My neighbor a famous Professor of . . .
There are two gods named Mendax and Fidelis, one on your left, the other on . . .
An elephant weighing 2 tonnes (2 metric tons) and a rabbit weighing 1kg are . . .
Sasha is learning about Archimedes at school. His show-off sister is 3 years . . .
Leslie Green asks: Engineers need to use quantities which can vary over at . . .
The boss of a 10 person company is always the last to arrive, and gets the . . .