SOLUTION: the average age of 3 children in the family is 9yrs. if the average age of their parent is 39 yrs,the average age of the whole family is...........

Question 1031271: the average age of 3 children in the family is 9yrs. if the average age of their parent is 39 yrs,the average age of the whole family is...........
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
3*9 + 2*39 = 105
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105/5 = 21

Answer by ikleyn(52803) (Show Source): You can put this solution on YOUR website!
.
the average age of 3 children in the family is 9yrs. if the average age of their parent is 39 yrs,the average age of the whole family is...........
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= 21 year.

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