ECZ 2019 · GCE Paper 1 — Variation
y varies directly as x and inversely as the square of z, with constant k = 5 (so y = 5xz²). Find y when x = 20 and z = 5.
- A. 20
- B. 4
- C. 100
- D. 2
Verified working — step 1
y = 5xz² = 5 × 205² = 10025= …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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