1 Doughnut, 8 Pieces
You and 3 of your friends are exhausted and over-worked after a very long day. When you walked back home, you realize that you forgot to cut the large doughnut that the 4 of you share. Each person only has the energy to have one slice using a knife, and you need 8 pieces for the four of you. However, unlike usual, one person decided to have the doughnut later and went to sleep.
Now, the remaining 3 of you have to use 3 cuts to make eight pieces.
Is it possible to do this?
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1 solution
Since a doughnut is 3D, you can make one cut directly down, one cut perpendicular to that and one cut across its height