# What was the age of father in years at the time of birth of the child?

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Sum of the ages of a boy and his father is 70 years. Before 20 years Father's age was 9 times the age of the boy.
What was the age of father in years at the time of birth of the child?

posted Dec 23, 2016

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Age of father at the birth of son is 24.

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Let son age is X before 20 years. Which makes father's age as 9X.

20 years back the sum of their ages will be 40 less than 70.
I. E. 70 - 40 = 30.

X + 9X = 30
10X = 30
X= 3
Son.was 3 years before 20 years and father was 27.

Therefore at birth of the son, the father would be 27-3= 24.

the age of father in years at the time of birth of the child was =24 years
Sum of the ages of a boy and his father is 70 years =47 +23 =70
Before 20 years Father's age was 9 times the age of the boy.
47 -20 =27
and 23-20=3
so, Father's age was 9 times the age of the boy. (3 * 9=27).
so, the age of father in years at the time of birth of the child was =47-23 = 24 years

Age of the father at time of birth of his son would be 3 years less than 27

27 - 3 = 24
I subtracted son's age (present) from father's age (present), this will also give  father's age  at the time of birth of his son procedure is different but the answer is same
Agreed. :))

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