A

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Q. In 10 years A will be twice as old as B was 10 years ago. If A is now 9 years older than B, what is the present age of B?

  • (A) 38 years
  • (B) 39 years
  • (C) 40 years
  • (D) 41 years
  • Correct Answer - Option(B)
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Explanation by: Admin
Let the present age of B and A be x and ( x + 9 ) years; then,
Age of B and A after 10 years will be x + 10 and x + 9 + 10;
According to question,
In 10 years A will be twice as old as B was 10 years ago
2(x - 10) = x + 9 + 10
2x - 20 = x + 19
⇒ 2x - x = 19 + 20
∴ x = 39 years

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