A detective interviews four brothers—A, B, C, and D—about a missing ring. Exactly one brother stole it. - A says: 'B took it.' - B says: 'D took it.' - C says: 'I did not take it.' - D says: 'B is lying.' If three brothers are telling the truth and only one is lying, who stole the ring?
Brother B
Statements B and D contradict each other, so one is true and one is false. Since there is only one lie overall, A and C must be telling the truth. A says 'B took it', which means B is the thief.
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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