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More knights,liars,and knaves (Posted on 2003-07-07) Difficulty: 2 of 5
Knights always tell the truth,liars always lie,and knaves alternate between truths and lies.

Two people named Jimmy and Johnny make the following claims.

Jimmy:I am a knave.
Johnny:Jimmy is not a knight.
Jimmy:Johnny is a knave.
Johnny:Jimmy is a knave.

What are each?

  Submitted by Tim Axoy    
Rating: 3.5556 (9 votes)
Solution: (Hide)
Jimmy's first statement that he is a knave can be made by all types but a knight. Johnny said Jimmy is not a knight,so Johnny cannot be a liar.

Jimmy can either be a knave who told the truth first and lied second or a liar who always lies. Either way,his second statement is a lie,so Johnny is not a knave.

That proves Johnny is a knight. Therefore,his second statement was true,so Jimmy is a knave.

In summary,Jimmy is a knave and Johnny is a knight.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolAndre2010-06-02 19:07:52
SolutionSolutionDej Mar2008-07-01 04:55:02
SolutionPuzzle ResolutionK Sengupta2007-07-11 05:46:41
SolutionSolutionCharleyA.2007-01-25 22:03:05
no sub.nate2004-12-04 21:41:55
re:No SubjectIain2004-03-22 12:10:15
Hints/TipsNo SubjectSheets2003-10-13 07:42:54
SolutionsolutionAndrew Mitchell2003-08-08 12:22:33
re: AnswerJeff2003-07-19 22:47:05
Solution?Federico Kereki2003-07-14 15:10:41
AnswerPaul Spykerman2003-07-12 09:54:13
Solutioni guessmike2003-07-11 17:10:07
solutionerica2003-07-10 17:06:24
re(2): SolutionAbby2003-07-10 04:09:57
SolutionI'm Jimmy and I'm not a Knave!Jim C2003-07-07 07:33:25
Solutionre: Solutionfwaff2003-07-07 06:32:25
SolutionSolutionLewis2003-07-07 05:15:57
re: SolutionCharlie2003-07-07 03:31:37
SolutionJonny Doe2003-07-07 03:24:35
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