The present ages of three person in proportions 4 : 7 : 9 Eight years ago, the sum of their ages was Find their present ages (in year).

A 8, 20, 28

B 16, 28, 36

C 20, 35, 45

D None of these

Correct Answer: Option B

Let their present ages be 4x, 7x and 9x years respectively.

Then, (4x - 8) + (7x - 8) + (9x - 8) = 56

=> 20x = 80

=> x= 4.

Therefore, Their present ages are 4x = 16 years,7x = 28 years and 9x = 36 years respectively.