A father is now three times as old as his son. Five years back, he was four times as old as his son. The age of the son (in years) is

– by
Question: A father is now three times as old as his son. Five years back, he was four times as old as his son. The age of the son (in years) is
[A].

12

[B].

15

[C].

18

[D].

20

Answer: Option B

Explanation:

Let son’s age be x years. Then, father’s age = (3x) years.

Five years ago, father’s age = (3x – 5) years and son’s age = (x – 5) years.

So, 3x – 5 = 4 (x – 5) 3x – 5 = 4x – 20 x = 15.