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Nine kids (Posted on 2004-09-09) Difficulty: 3 of 5
My neighbor has nine kids (all under 21), and their ages are such that you can never pick three kids so that the middle one is the average of the ages of the extreme ones. What are their ages?

(Note that you could also say that you can never find three kids whose ages are in arithmetic progression.)

See The Solution Submitted by e.g.    
Rating: 4.1250 (8 votes)

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Solution | Comment 2 of 22 |
The kids are aged,

1, 2, 4, 5, 7, 16, 18, 19 & 21.

Oooops, no their not, thanks FK

Edited on September 9, 2004, 8:19 am
  Posted by Juggler on 2004-09-09 08:07:47

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