The average age of A, B and C is 25 years. The ratio of their age is 3 : 5 : 7. What is the age of A?

12 years
15 years
18 years
21 years

Correct Answer: 15 years

Explanation:

Let the present ages of A, B and C are 3x, 5x and 7x years respectively; then
According to question,
3x + 5x + 7x = 3 x 25
⇒ 15x = 75
∴ x = 5
Hence, age of A = 3x = 3 x 5 = 15 years

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