Multiple choice

The ratio of the father's age to the son's age is 4 : 1. The product of their ages is 196. What will be the ratio of their ages after 5 years?

  1. $11 : 3$
  2. $11 : 4$
  3. $12 : 4$
  4. $12 : 3$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let father's age = 4x, son's age = x. Product = 4x^2 = 196, so x^2 = 49, x = 7. Current ages: father=28, son=7. After 5 years: father=33, son=12. Ratio = 33:12 = 11:4. Option B correct.