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There are three chests, each containing 100 coins. One chest has 100 gold coins, one has 100 silver coins, and one has half & half. The catch: the chests are all labeled incorrectly. You may pull out just one coin from any of the chests, then you must identify which chest contains all gold coins. How do you do it?
Pick from the one labeled 50/50. If you pull a gold coin, you know the whole chest is gold. If you pull silver, you know the whole chest is silver, thus the one labeled gold must be 50/50 and the one marked silver is all gold.
Did you know the answer?