You have three closed boxes labeled 'Apples', 'Oranges', and 'Mixed'. Every single box is known to be incorrectly labeled. You may draw one piece of fruit from only ONE box without looking inside. Which box should you pick from to figure out the correct contents of all three boxes?
The box labeled 'Mixed'
Because all labels are wrong, the box labeled 'Mixed' cannot contain mixed fruit; it must contain only apples or only oranges. If you draw an apple from 'Mixed', that box is definitely 'Apples'. The box labeled 'Oranges' cannot be 'Oranges' (wrong label) nor 'Apples' (already identified), so it must be 'Mixed'. Finally, the box labeled 'Apples' must be 'Oranges'.
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: Hard. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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