Age of X is 6 times that of Y. After 4 years

Age of X is 6 times that of Y. After 4 years, X is 4 times elder to Y. What is the present age of Y?

  1. 4 yr
  2. 5 yr
  3. 6 yr
  4. 7 yr

Answer

Let age of Y be y years. So, age of X = 6y years. 

After 4 years, age of X = 6y + 4 = 4(y + 4) = 4y + 16

Or 2y = 12 i.e y = 6 years

The correct option is C.