SOLUTION: The average age of the two Jones children is 5. The average of the three Smith children is 15. The average age of the five children together is?

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Question 145344: The average age of the two Jones children is 5. The average of the three Smith children is 15. The average age of the five children together is?
Answer by solver91311(24713) About Me  (Show Source):
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If the average age of the two Jones children is 5, then the sum of their ages must be 10, because the average of two values is computed by AVG=%28x%5B1%5D%2Bx%5B2%5D%29%2F2. Likewise the sum of the 3 Smith childrens' ages must be 3%2A15=45. That means the sum of all 5 childrens' ages must be 10%2B45=55, and the average of the 5 is 55%2F5=11