Multiple choice

Eight years ago from present, A was four times as old as B. After 8 years from present, A will be twice as old as B. Find their present age.

  1. 42, 16

  2. 45, 18

  3. 42, 18

  4. 40, 16
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let present ages be A and B. Eight years ago: A-8 = 4(B-8), giving A = 4B - 24. After eight years: A+8 = 2(B+8), giving A = 2B + 8. Equating: 4B - 24 = 2B + 8, so 2B = 32, B = 16. Then A = 2(16) + 8 = 40. Present ages: 40, 16. Option A has wrong B value. Options B and C have incorrect values.

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