Multiple choice

5 years ago the average age of father and his son was 35 years and the ratio of their present ages is 4 : 1 so find the ratio of their ages after 10 years?

  1. $25 : 11$
  2. $42 : 11$
  3. $37 : 13$
  4. $13 : 37$
  5. None of these

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

Let father's present age be 4x, son's be x. 5 years ago: (4x-5) + (x-5) = 70 (average 35, so sum 70). So 5x - 10 = 70, x = 16. Present ages: father = 64, son = 16. After 10 years: father = 74, son = 26. Ratio = 74:26 = 37:13. Option C is correct.