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'Weekly Problem 15 - 2009' printed from http://nrich.maths.org/

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Ali and Baba

Ali (A) and Baba (B) are shown surrounded by six thieves. The thieve's ages are given. Ali's age is the average of his four nearest neighbours', and so is Baba's. How old is Ali?

 

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

This problem is taken from the UKMT Mathematical Challenges.

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