Question 9
Quadratic EquationsA student bought some packets of pens for ₦2,160. If she had paid ₦24 less for each packet, she could have bought three more packets. How many packets did she buy?
- A.20
- B.10
- C.15
- D.5
Show the answer and explanation
Answer: C (15)
Explanation
(2160/x − 24)(x + 3) = 2160 simplifies to x² + 3x − 270 = 0, so x = 15 (check: ₦144 each; ₦120 × 18 = ₦2,160).