Three boxes are labeled 'Apples', 'Oranges', and 'Apples and Oranges'. All three labels are guaranteed to be completely incorrect. You are allowed to pull out and look at just one single piece of fruit from the box labeled 'Apples and Oranges'. Which box's true contents can you immediately identify from that single piece?
You can identify the contents of all three boxes.
Since the label 'Apples and Oranges' is wrong, that box must contain *only* apples or *only* oranges. If you draw an apple from it, that box is 'Apples'. The box labeled 'Oranges' cannot contain oranges (label is wrong) and cannot contain apples (already found). Thus, 'Oranges' must contain 'Apples and Oranges', leaving the 'Apples' box to hold '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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