ECZ 2019 · O-Level Paper 1 — Variation
a varies directly as b and as the square of c, and a = 30 when b = 2.5 and c = 2. Find the values of c when a = 300 and b = 4.
- A. c = 5 or c = -5
- B. c = 10 or c = -10
- C. c = 25 or c = -25
- D. c = 5 only
Verified working — step 1
Pin down k from the first set of values, then solve backwards for the squared unknown.The full step-by-step working and final answer, plus the video lesson for this topic, 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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