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Unilorin Post-UTME Mathematics 2015 (Model questions) Question 21

Question 21

Quadratic Equations

When the price of egg was raised by ₦2 an egg. The number of eggs which can be bought for ₦120 is reduced by 5. Find present price of an egg

  1. A.₦6
  2. B.₦10
  3. C.₦8
  4. D.₦5
Show the answer and explanation

Answer: C (₦8)

Explanation

If the old price is x, 120/x − 120/(x + 2) = 5, which gives x2 + 2x − 48 = 0, so x = 6 and the present price is ₦8.