The ratio of ages of A and B, 4 years ago, was 5 : 7. The ratio of their ages after 4 years from now will be 7 : 9. What will be the ratio of ages of A and B after 12 years from now?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 9 : 11
Let the age of A and B 4 years ago be 5x and 7x
According to question,
(5x + 8)/(7x + 8) = 7 : 9
45x + 72 = 49x + 56
4x = 16, x = 4
Present age of A and B is 5x + 4 and 7x + 4 i.e 24 yrs & 32 yrs
The ratio of ages of A and B after 12 years from now will be
24 + 12 : 32 + 12 = 9 : 11