A merchant has three identical-looking boxes. One contains only gold coins, one contains only silver coins, and one contains a mix of both. Every box is labeled incorrectly. The merchant lets you draw just one coin from a single box to fix all the labels. Which box do you choose?
The box labeled 'Mixed'
Since all labels are wrong, the 'Mixed' box cannot actually contain a mix. Therefore, it must contain either all gold or all silver. Drawing one coin reveals its true contents, and because you know the other two labels are also wrong, you can deduce the rest.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Medium. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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