Multiple choice

Ten years ago, a father was 3 times older than his son. After ten years, the father is twice the age of his son. What is the ratio of the father's present age to the son's present age?

  1. 7 : 3

  2. 3 : 7

  3. 2 : 1

  4. 3 : 1

  5. None of these

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A Correct answer
Explanation

Let the ages of father and son 10 years back be 3x and x, respectively. (3x+10)+10 : (x+10)+10 = 2 : 1 or x = 20  Required ratio = 7 : 3