Three jars are labeled 'Red', 'Blue', and 'Mixed'. All three labels are incorrect. You pick one marble from the jar labeled 'Blue' and it is Red. What is the actual content of the jar labeled 'Blue'?
Mixed
The jar labeled 'Blue' cannot contain all Blue (mislabeled). Since you drew a Red marble, it could be 'All Red' or 'Mixed'. If 'Blue' were 'All Red', then the jar labeled 'Mixed' would have to be 'Mixed' (which violates all labels being wrong). Thus, the jar labeled 'Blue' must actually be 'Mixed'.
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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