Question

A father is at present three as old as his son . Five years back he was four times as old as his son. Find the age of his son

• A. 12 years
• B. 15 years
• C. 18 years
• D. 20 years

Answer 1

Answer: (B)

15 years

Present age of the son is 'x' years his father's age is 3x
Five year ago:
Son's age = x - 5 and father's age = $3x-5$
$\therefore 3x-5=4(x-5)$ or x = 15