Three boxes contain fruit. One contains only apples, one only oranges, and one both apples and oranges. Every single box is labeled incorrectly (e.g., the box labeled 'Apples' does not contain only apples). You are allowed to draw exactly one fruit from one box of your choice to figure out the contents of all boxes. Which box should you draw from?
The box labeled 'Apples and Oranges'
Since all boxes are mislabeled, the box labeled 'Apples and Oranges' must contain either only apples or only oranges. If you draw a fruit from it and it's an apple, that box contains only apples. Because the 'Apples' box cannot contain apples, it must contain 'Apples and Oranges' (since the oranges-only box is left for the remaining label).
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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