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WAEC Mathematics 2025 Question 12

Question 12

Variation

A variable P varies inversely as the square of Q. If P = 5 when Q = 6, find Q when P = 1.8.

  1. A.5
  2. B.10
  3. C.15
  4. D.20
Show the answer and explanation

Answer: B (10)

Explanation

P = k/Q²: k = 5 × 36 = 180. Then Q² = 180 ÷ 1.8 = 100, so Q = 10.