Multiple choice general knowledge math & puzzles

A father is three times as old as his son. After fifteen years the father will be twice as old as his son's age at that time. What is the present age of the father?

  1. 36

  2. 42

  3. 45

  4. 48

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let son be x, father 3x. In 15 years: 3x + 15 = 2(x + 15). Solving gives x = 15. Father's present age is 3x = 45. Distractors like 36 or 42 do not satisfy the 'twice as old' condition after 15 years.