Multiple choice

The ratio between the present ages of P and Q is 5:8. After four year, the ratio between their ages will be 2:3. What is Q’s age at present?

  1. 36

  2. 20

  3. 24

  4. 32

  5. none
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Let the present ages of P and Q be 5x and 8x, respectively. (5x + 4)/(8x + 4) = 2/3 = 3(5x + 4) = 2(8x + 4) = 15x + 12 = 16x + 8 = x = 4 Therefore, the present age of Q = 8x = 32.

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