Practice30 Create account

The ratio of the present ages of A and B is 5 : 7. Four years ago, the ratio of their ages was 2 : 3. What is A's present age?

Competition practiceRatio, Proportion & Mixtures

A24
B16
C20
D28

Step-by-Step Solution

Let ages be

5 x

and

7 x

. Then

(5 x - 4) / (7 x - 4) = 2/3

, so

15 x - 12 = 14 x - 8

, giving

x = 4. A = 5 \times 4 = 20

.

Answer: C) 20

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Ratio, Proportion & Mixtures practice questions

More Ratio, Proportion & Mixtures practice

In a 72-litre drum, milk and water are mixed in the ratio 5 : 1. How many litres of…Nikhil's and his elder brother Om's present ages are in the ratio 4 : 9. In 5 years the…The present ages of A and B are in the ratio 5 : 3. After 6 years the ratio of their…A mixture contains milk and water in the ratio 5 : 1. When 6 litres of water is added,…Milk and water are in the ratio 4 : 1 in a 45-litre can. How much water must be added to…