Question

After 10 years the age of A will be twice of the age of B what he was 10 years ago . If A is 9 year younger then B now, than what is the present age of B ?
​

Answer 1

Answer:

Let B's present age = x years. Then, A's present age = (x + 9) years.

(x + 9) + 10 = 2(x - 10)

=> x + 19 = 2x - 20

=> x =39.