You are given two ropes and a lighter. Each of the two ropes has the following property: if you light one end of the rope, it will take exactly one hour to burn to the other end. It doesn’t necessarily burn at a uniform rate. How can you measure a period of 45 minutes?
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Circle in a chess board Consider an infinite chessboard, where the squares have side length of 1. The squares are colored black and whit...
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A inch diameter round pizza has been sliced by straight cuts, leaving a right triangle in the middle as shown here The edge of the...
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100 Gold Coins Five pirates have obtained 100 gold coins and have to divide up the loot. The pirates are all...
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