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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, the present age of B is:

  • 1
    20 years
  • 2
    19 years
  • 3
    39 years
  • 4
    29 years
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Answer : 3. "39 years"
Explanation :

Let's B's present Age=x years. Then, A's present age=(x+9) years.

so (x+9) +10=2(x-10) ⇔x=39.

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