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JAMB Mathematics 2007 Question 22

Question 22

Variation

W ∝ L2 and W = 6 when L = 4. If L = √17, find W.

  1. A.6 7/8
  2. B.6 5/8
  3. C.6 3/8
  4. D.6 1/8
Show the answer and explanation

Answer: C (6 3/8)

Explanation

W = kL2: 6 = 16k, so k = 3/8. Then W = 3/8 × 17 = 51/8 = 6 3/8.