perplexus.info :: Liars and Knights : Knights being Liars?

Knights being Liars? (Posted on 2003-06-10)

You meet six men on a road side. The problem is that your wallet is mysteriously missing and you can't figure out if these men are truth tellers or not. So you ask a few questions and here are their answers:

Allan: "Fred stole it. Fred also hears quite well."

Barry: "Calvin is a liar. I did not steal it and I know Allan did not steal it."

Calvin: "Allan and Dwayne are both knights. Eddy stole it."

Dwayne: "Allan is a liar. I did not steal it."

Eddy: "Only 4 of us are knights. I did not steal it. I know Calvin did not steal it."

Fred: "I am deaf but read lips. Barry did not steal it."

Who stole the wallet?

P.S. You are sure that all of the men either lie or tell the truth. No one does both.

Submitted by Jon

Rating: 3.4615 (13 votes)

Solution: (Hide)

Next time you accuse someone of stealing your wallet, make sure to look in your pocket for holes. No one stole it, Dwayne called Allan a liar. This means that at least one of the two must be a liar. Since Calvin said both were knights, he is a liar. Therefore Eddy did not steal it. Eddy confesses to not stealing it making him a knight. We now know that Calvin did not steal it. Barry called Calvin a liar. This is true so Barry tells the truth. We now know that neither Barry or Allan stole the wallet. Fred said that Barry is innocent. This is the truth. Fred is a deaf knight. Since Allan said Fred could hear, he is a liar and lied about Fred stealing it. Dwayne said Allan is a liar which is the truth. Dwayne did not steal it then. This makes you having lost your wallet by the large hole in you trousers. Luckily, it hadn't gone all the way out of you pants yet was stuck in the lining, so you still have money to pay the lawyer you will need for the trial.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Sol	Andre	2010-06-04 18:33:52
Some Thoughts On The Problem	K Sengupta	2007-10-27 05:57:02
No Subject	Terence	2005-10-08 16:40:59
Solution	Federico Kereki	2003-10-27 13:03:57
Solution	Lawrence	2003-08-24 16:03:21
Solution and inane ramblings	fwaff	2003-06-12 06:54:10
re: sollution...	Jonny Doe	2003-06-12 06:14:41
sollution...	rob	2003-06-12 05:05:47
re: Eliminate	Charlie	2003-06-11 16:53:37
Eliminate	Bob	2003-06-11 16:37:28
re: Fred??	Lewis	2003-06-11 07:18:14
Fred??	Jonny Doe	2003-06-11 07:03:23
re: Perception and Reality	friedlinguini	2003-06-11 03:59:46
P&R redux	gordo packard	2003-06-11 00:53:40
re: Perception and Reality	DJ	2003-06-10 15:51:45
Perception and Reality	Brian Smith	2003-06-10 15:07:47
liar!	DJ	2003-06-10 14:14:56
hmm.	Cory Taylor	2003-06-10 12:28:10
I know, I know!	Chris	2003-06-10 12:12:27
re: solution (assuming...)	friedlinguini	2003-06-10 11:46:23
Error	Jonny Doe	2003-06-10 10:49:53
re: Solution (whoops, done it wrong)	Lewis	2003-06-10 10:18:48
Solution	Lewis	2003-06-10 10:15:14
solution (assuming...)	Charlie	2003-06-10 09:52:36

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