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Logical Nonsense (Posted on 2003-08-26) Difficulty: 4 of 5
  • All, who neither dance on tight ropes nor eat peanut butter, are tall.

  • Creatures with spikey hair who look silly will go swimming if they do not dance on tight-ropes.

  • A kangaroo looks silly wearing sunglasses.

  • A smart creature will always do what he ought to do.

  • No one ought to go swimming who looks silly and eats peanut butter.

  • A smart driver wears sunglasses.

  • Kangaroos that have sneezing fits are avoided.

  • Short creatures who go driving have sneezing fits.

  • No creatures ought to dance on tight-ropes if they have sneezing fits.

  • All, who do not dance on tight-ropes and who are avoided, have spikey hair.
Therefore, no short kangaroos who are smart...

  Submitted by DJ    
Rating: 4.2105 (19 votes)
Solution: (Hide)
No short kangaroos who are smart will go driving.

The proof of this is as follows:

Assume that he will go driving.

  • A short creature who goes driving will have sneezing fits.

  • A smart creature who has sneezing fits will not dance on tight-ropes.

  • A short creature who does not dance on tight-ropes must eat peanut butter.

  • Also, a kangaroo who has sneezing fits will be avoided.

  • A creature who is avoided and who does not dance on tight-ropes must have spikey hair.

  • A smart driver wears sunglasses.

  • A kangaroo wearing sunglasses looks silly.

  • A silly creature who eats peanut butter and is smart will not go swimming.

  • However, a creature with spikey hair who looks silly and does not dance on tight-ropes will go swimming.

Here, we have a contradiction; the same creature will not go swimming and will go swimming, so the assumption that the kangaroo in question can drive must be false.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
The first comma threw me off.John2005-08-01 02:46:17
Some Thoughtsone more thing :-)cat2003-08-31 00:24:23
Hey, DJ, What happenedLawrence2003-08-28 19:28:14
re: Here is a LOGICAL solution.....DJ2003-08-28 10:55:59
SolutionHere is a LOGICAL solution.....Dan Erickson2003-08-27 16:58:45
re(3): answercatherine2003-08-27 15:51:28
re(2): answercatherine2003-08-27 15:45:42
re: answerDJ2003-08-27 13:13:27
re: answercatherine2003-08-27 03:19:59
answerTalon50002003-08-27 01:26:31
my tentative solutioncatherine2003-08-26 23:26:31
ContinuationHans2003-08-26 17:56:55
QuestionPushed?Gamer2003-08-26 16:00:45
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