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 value of k, the constant of variation.
- A. 12
- B. 10
- C. 3
- D. 30
Verified working — step 1
Translate the words first: "directly as b AND as the square of c" multiplies both onto k - everything on top, nothing underneath.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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