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After 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older then B, the present age of B is?

19 years
29 years
39 years
49 years

Correct Answer: 39 years

Explanation:

Let the present ages of B and A be x years and (x + 9) years respectively.
Then, (x + 9 + 10) = 2(x - 10)
∴ x = 39

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