The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is excluded. How old is the mother?
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Answer:
The average age of the mother and her six children is 12 years
Total sum of age = 12*(1+6)
= 12*7 = 84
The average is reduced by 5 years if the age of the mother is excluded.
So the sum of age of children
= 6*(12-5)
= 6*7 = 42
Finally age of mother is,
84 - 42 = 42 years
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