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WAEC Mathematics 2026 Question 29

Question 29

Variation

A variable Z varies directly as X and inversely as Y. If Z = 12 when X = 4 and Y = 5, find Z when X = 6 and Y = 45.

  1. A.112.5
  2. B.2
  3. C.15
  4. D.1/5
Show the answer and explanation

Answer: B (2)

Explanation

Z = kX/Y: 12 = 4k/5 gives k = 15. Then Z = 15 × 6 ÷ 45 = 2.