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?

39 year
40 year
36 year
49 year

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

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