Correct Answer - Option 3 : 15 years
GIVEN:
Ashish : Akash (ages) = 9 : 11
Ashish's age = 45 years
EXPLANATION:
A.T.Q
45/Akash's age = 9/11
Akash's age = 55 years
Let their ages were 3 : 4 x years ago,
∴ (45 - x)/(55 - x) = 3/4
⇒ 180 - 4x = 165 - 3x
⇒ x = 15 years
∴ Their ages were 3 : 4, 15 years ago.