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WAEC Mathematics 2011 Question 33

Question 33

Variation

G varies directly as the square of H. If G is 4 when H is 3, find H when G = 100.

  1. A.15
  2. B.25
  3. C.75
  4. D.225
Show the answer and explanation

Answer: A (15)

Explanation

G = kH2: 4 = 9k, so k = 4/9. 100 = (4/9)H2 gives H2 = 225 and H = 15.