Multiple choice

The present ratio between the age of A and B is 3 : 4. After four years, B will be elder than A by 5 years. What is the present age of A?

  1. 15 years

  2. 18 years

  3. 20 years

  4. 25 years

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

Let ages be 3x and 4x. After 4 years: (4x+4) - (3x+4) = 5, giving x = 5. So A's present age = 3*5 = 15 years. B is 20 years, and the difference is indeed 5 years after 4 years.