Three boxes contain fruit. Box A has apples. Box B has oranges. Box C has both apples and oranges. Every single box is labeled incorrectly. You may draw one fruit from Box C. What can you definitively determine?
You can determine the contents of all three boxes based on what you pull.
Box C's label is wrong, so it cannot contain both apples and oranges; it must contain either only apples or only oranges. Since you draw from Box C, whichever fruit you pull reveals Box C's true contents. By extension, the remaining mislabeled boxes can be sorted instantly.
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: Easy. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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