Farmer John is a real 'character' and you are unsure if he is mathematically illiterate.
He has just told you to take half the hay and move it to the west pasture, then take 3/8ths of the hay and move it to the east pasture, then take 1/5th of the hay and move it to the north pasture. He is in a hurry and wants it done by the time he gets back. You have written down his instructions.
How much hay remains in the barn when you are finished?
by Leslie Green