Ratio of the ages of A and B is 6 : x. A is 18 years younger to C. After 9 years C will be 57 years old. If the difference between the ages of A and B is same as the age of C, what is the value of x?
Answer & explanation
Correct answer: option 4
Present age of C = 57 - 9 = 48 years
Present age of A = 48 - 18 = 30 years
A B
6 : x [ 6 → 30 so 1 → 5]
↓
×5
5x
Now ⇒ 5x - 30 = 48
x = \(\frac{78}{5}\) = 15.6