At present, A is younger than B by 8 years. If 4 years ago, their ages were in the ratio 1 : 2, then what is the present age of B (in years)?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 20.
Let the present age of A = x years
So, present age of B = (x + 8) years
If 4 years ago, their ages were in the ratio 1 : 2
So,
(x - 4)/(x + 4) = 1/2
⇒ 2(x - 4) = (x + 4)
⇒ 2x - 8 = x + 4
⇒ x = 12
Thus, the present age of B = x + 8 = 12 + 8 = 20