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Applications of Pair of Equations

A father's ag...

Question

A father's age is thrice his son's age. The sum of their ages is 40 years. Find the son's age.

A

12 years

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B

11 years

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C

9 years

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D

10 years

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Solution

The correct option is D
10 years

Let the age of the son be x, then the age of father is 3x.

Sum of their ages is 40.

x + y = 40

x + 3x = 40

4x = 40

x = $\frac{40}{4}$

= 10 years

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Applications of Pair of Equations

Standard IX Mathematics

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