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WAEC Mathematics 1997 Question 12

Question 12

Variation

P varies inversely as the square of W. When W = 4, P = 9. Find the value of P when W = 9

  1. A.729/16
  2. B.6
  3. C.4
  4. D.16/9
  5. E.4/3
Show the answer and explanation

Answer: D (16/9)

Explanation

P = k/W2; 9 = k/16 gives k = 144. When W = 9, P = 144/81 = 16/9.