Nihira is 25 years old and Punith is 30 years old. How many years ago was the ratio of their ages 3 : 4?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 10 years.
Let's x years ago, the ratio of the ages of Nihira and Punith was 3 : 4
So, (25 - x)/(30 - x) = 3/4
⇒ 100 - 4x = 90 - 3x
⇒ 4x - 3x = 100 - 90
⇒ x = 10
Therefore, the ratio of their ages 10 years ago was 3 : 4.