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WAEC Mathematics 2000 Question 39

Question 39

Variation

Given that p varies directly as q while q varies inversely as r, which of the following statements is true?

  1. A.r varies directly as p
  2. B.p varies inversely as r
  3. C.p varies directly as r
  4. D.q varies inversely as p.
Show the answer and explanation

Answer: B (p varies inversely as r)

Explanation

p = kq and q = c/r, so p = kc/r: p varies inversely as r.