Multiple choice

The product of my age 5 years ago and after 9 years is 15. What is my present age?

  1. 9 years

  2. 6 years

  3. 5 years

  4. 4 years

  5. 12 years
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let present age be x. Age 5 years ago: x-5. Age after 9 years: x+9. Product: (x-5)(x+9) = 15. x^2 + 4x - 45 = 15, so x^2 + 4x - 60 = 0. (x+10)(x-6) = 0, so x = 6 (positive age). Option B is correct.

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