SOLUTION: The mean of ages of 8 brothers is 2o but when the age of their mother is added, the mean age becomes 25. What is the age of their mother

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Question 1143655: The mean of ages of 8 brothers is 2o but when the age of their mother is added, the mean age becomes 25. What is the age of their mother
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39620) About Me  (Show Source):
Answer by ikleyn(52803) About Me  (Show Source):
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Since the mean of 8 brothers is 20, the sum of their age is 8*20 = 160.


Now the equation to solve the problem is


    %28160%2BM%29%2F9 = 25.


Solve it to find M, the mother's age.

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