Problem from a puzzles book:

Your eccentric Uncle Jake is a rare coin collector. He has twenty-four coins that appear identical, except only one is solid gold; the others are made of a heavier alloy. He sits you in front of a balance and says you can have the gold coin if you can find it. You can use the scale only three times. How can can you find the lightest coin?


Since the GOLD coin is the LIGHTEST, all the other coins are made of highly toxic, radio-active heavy metals. To find the gold coin:

As Jake said, "You can have the gold coin if you can find it."
You found it.