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  1. 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 ?
    1. 19 years
    2. 29 years
    3. 39 years
    4. 49 years
Correct Option: C

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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