Multiple choice

At present, A is younger than B by 8 years. If 4 years ago, their ages were in the ratio 1:2, then what is the present age of B (in years)?

  1. 11

  2. 20

  3. 12

  4. 18
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let A = x, B = x + 8. Four years ago: A-4 = x-4, B-4 = x+4. Ratio (x-4):(x+4) = 1:2, so 2(x-4) = x+4, giving 2x-8 = x+4, so x = 12. Present age of B = x + 8 = 20 years.

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