In ten years, A will be twice as old as B was 10 years ago. If A is now 9 years older then B. Find the present age of B?
Correct Answer: 39 year
Explanation:
Let B's present age be x years then A's present age be (x + 9) years
As per the given condition
(x + 9 + 10) = 2(x - 10)
⇒ x = 39 ∴ The present age of B = 39 years
