Problems on Ages Practice Test 1 with solutions

Question : 18 of 40

Marks: +1, -0

The ages of A and B are in the ratio of 11 : 13 respectively. After 7 years the ratio of their ages will be 20 : 23. What is the difference in years between their ages?

4 years
5 years
6 years
7 years

Validate

Solution:

Let the present ages of A and B are 11x and 13x years respectively; then

{11x+7}/{13x+7}

{20}/{23}

⇒ 253x + 161 = 260x + 140
⇒ 7x = 21
∴ x = 3
Hence, difference of their ages = 13x – 11x = 2x = 2 × 3 = 6 years

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