ECZ 2026 · GCE Paper 1 — Variation
P varies as q and inversely as the square of r, and when p = 6, q = 18 and r = 3. Find the values of r when p = 3 and q = 25.
- A. r = 5 or r = -5
- B. r = 5 only
- C. r = 25 or r = -25
- D. r = 3 or r = -3
Verified working — step 1
Build the formula, find k from the first set of values, then substitute and dig r2 out of the denominator.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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