1.

The ratio between the present ages of A and B is 3 : 5. If the ratio of their ages five years after becomes 13 : 20, then the present age of B is:1. 40 years2. 35 years3. 30 years4. 32 years

Answer» Correct Answer - Option 2 : 35 years

Given:

The ratio between the present ages of A and B is 3 : 5.

The ratio of their ages five years after becomes 13 : 20.

Calculation:

Let the proportional ratio be x

According to the question,

(3x + 5)/(5x + 5) = 13/20

⇒ 60x + 100 = 65x + 65

⇒ 5x = 35

⇒ x = 7

The present age of B = 5x = 5 × 7 = 35

∴ The present age of B is 35 years.



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