Multiple choice

The ages of Rahul and Sumit are in the ratio of (3: 7) respectively. After 5 years the ratio of their ages will be (1: 2). What is the difference in their ages?

  1. 2 years

  2. 8 years

  3. 20 years

  4. 12 years

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

Let ages be 3x and 7x. After 5 years: (3x+5)/(7x+5) = 1/2. Cross-multiply: 6x+10 = 7x+5, giving x=5. Current ages are 15 and 35, so difference = 20 years.