The following is another puzzle from the Irishman Owen O’Shea.
“Suppose you buy 100 pounds of potatoes and you are told that 99 percent of the potatoes consist of water.
You bring the potatoes home and leave them outside to dehydrate until the amount of water in the potates is 98 percent. What is the weight of the potatoes now?”
This problem takes a little concentration to get right and the solution is a bit surprising at first.
See Weight of Potatoes for solutions.