ECZ 2021 · GCE Paper 1 — Variation
Given that z varies as x and inversely as the square of y, with constant of variation k = 6, find the value of z when x = 18 and y = 3.
- A. 4
- B. 12
- C. 36
- D. 108
Verified working — step 1
z = 6xy² = 6 × 18 ÷ 9 = 108 ÷ 9 = …The full step-by-step working and final answer are included with Premium — checked against ECZ marking standards.
Original examination question © Examinations Council of Zambia. Worked solution and commentary © G12 Titan — not to be reproduced without permission.
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