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John who is 15 years old, is 3 years older than his younger brother Paul. If James their brother is 21years old. What is the average of the three brothers
6 years ago

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oobleck
the average of three numbers is just 1/3 of their sum.
So, add 'em up and divide by 3.
The only trick is figuring out how old Paul is ...
6 years ago
John stanard
Parents
4 years ago

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