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A father is nine times as old as his son and the mother is eight times as old as the son. The sum of the father's and the mother's age is 51 years. What is the age of the son?
1. 7 years
2. 5 years
3. 4 years
4. 3 years

1 Answer

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Best answer
Correct Answer - Option 4 : 3 years

Given 

Sum of father's age and mother's age = 51 years

Calculation 

Let the age of the son is z

Father’s age = 9z  and mother’s age  = 8z

So, 9z + 8z = 51 years

⇒ 17z = 51 years

⇒ z = 3 years

∴ The age of the son is 3 years

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