SOLUTION: A man had 7 children. When their average age was 12 years a child aged 6 years was lost.find the average age of the remaining 6 children.

Question 725572: A man had 7 children. When their average age was 12 years a child aged 6 years was lost.find the average age of the remaining 6 children.

Answer by god2012(113) (Show Source): You can put this solution on YOUR website!
Solution:
Let 'x' be the sum of ages of 7 children.
Average age of 7 = x/7 = 12 or x = 84
When the avg age of 7 is 12years, a 6 year old child is lost.
That is (84 - 6) is the sum of the ages of 6 children.
Average age of 6 children = (84-6)/6 = 78/6 = 13 years

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