Multiple choice general knowledge

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. 45 Years

  2. 40 years

  3. 50 years

  4. 60 years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let the son's present age be x. Then father's present age = 3x. After 15 years: father = 3x + 15, son = x + 15. Given: 3x + 15 = 2(x + 15). Solving: 3x + 15 = 2x + 30, so x = 15. Father = 3×15 = 45 years. After 15 years, father = 60, son = 30, and indeed 60 = 2×30. The answer is correct.

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