The ratio of the present age of A and C together to that of B and D together is 17:15. If the sum of the present ages of B and C is 13 years and B is four years younger to A, who is 12 years old, then find the difference between the present age of D and the present age of A (in years).
The present age of A = 12 years
The present age of B = 12 – 4 = 8 years
The present age of C = 13 – 8 = 5 years
The present age of D be d years
ATQ,
(12+5)/(8+d)=17/15
15-8=d
7=d
Required answer = 12-7=5 years
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