Multiple choice

The present ages of Sohan and Mohan are in the ratio 5 : 4. After 10 years, the ratio of their ages will become 7 : 6. What is the present age of Mohan?

  1. 4 years

  2. 12 years

  3. 16 years

  4. 20 years

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let present ages be 5x and 4x. After 10 years, (5x + 10) / (4x + 10) = 7 / 6. Cross-multiplying: 6(5x + 10) = 7(4x + 10) => 30x + 60 = 28x + 70 => 2x = 10 => x = 5. Mohan's present age is 4x = 4 * 5 = 20 years.