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'Weekly Problem 26 - 2009' printed from http://nrich.maths.org/

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The total weight of five ballet dancers is $425 \; \text{kg}$ and the average (mean) weight of ten rugby players is $40 \; \text{kg}$. What is the average weight of all fifteen people?

 

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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