Multiple choice

After 10 years A's age will be twice the B's age 10 years ago. If A's present age is 9 years more than B's present age, what is B's present age?

  1. 19 years

  2. 29 years

  3. 39 years

  4. 49 years

  5. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Let B's present age = x. A's present age = x+9. After 10 years: A = x+19, which equals 2×(B's age 10 years ago) = 2(x-10). So x+19=2x-20, giving x=39. B is 39 years old.

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