dad2paisley
19th May 2008 - 10:07 AM
Friends and a Wallet
You and your five friends, conveniently named A, B, C, D, and E, were hanging out when you spotted a wallet on the floor. You have a poor memory, but you remember that it is owned by one of your friends.
You: Whose wallet is this?
A: That's mine.
D: You're lying, A.
C: Yeah, A, you are lying.
B: A is not lying, guys.
D: That wallet is owned by C.
E: Yeah, D is telling the truth.
B: No, E. That's your wallet.
You remember that at least 2 of your friends always tell the truth (truthtellers), while at least 2 always lie (liars).
Thanks to your memory, however, you can't remember which friend lies or tells the truth.
Can you figure out who owns the wallet?
Redstripe
19th May 2008 - 10:26 AM
B is a liar, he says its A and E's
C and D told the truth..
its C
dad2paisley
19th May 2008 - 10:30 AM

you got it right.
C owns the wallet.
EXPLANATION:
B's first statement says that A is telling the truth that it is A's wallet. His second statement, however, says that it is E's wallet. The statements cannot be true at the same time, so B lied in both of them. B is a liar.
Since B was lying when he said that A is telling the truth, A is the other liar, too.
C and D are automatically truthtellers, since they both told the truth when they said A was lying. E is also a truthteller since he said that D told the truth.
Therefore, C owns the wallet.