SOLUTION: If a man has parents with average age 70 years, three children with 15 years average age, Both him and wife with average age 40 years, whats the average age of the family?

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Question 1101128: If a man has parents with average age 70 years, three children with 15 years average age, Both him and wife with average age 40 years, whats the average age of the family?
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
EXPLANATION:
An average of several values is the sum of those values divided by the number of values.
average%28couple%29=sum%28couple%29%2F2 <---> sum%28couple%29=2%2Aaverage%28couple%29 .
So the sum of the man'd parents' ages is 2%2A70 ,
and the sum of ages of the man and his wife is 2%2A40 .
For the 3 children,
average%28children%29=sum%28children%29%2F3 <--->
sum%28children%29=3%2Aaverage%28children%29 .
so the sum of the children's ages is 3%2A15
When we add the ages of all 2%2B2%2B3=7 family members,
sum%28all%29=sum%28parents%29%2Bsum%28man%2Bwife%29%2Bsum%28children%29 .

So, the average we can calculate for the whole family is