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JAMB Mathematics 2011 Question 16

Question 16

Variation

If x varies directly as square root of y and x = 81 when y = 9, find x when y = 1 7/9.

  1. A.20¼
  2. B.27
  3. C.2¼
  4. D.36
Show the answer and explanation

Answer: D (36)

Explanation

x = k√y: 81 = 3k, so k = 27. y = 16/9 gives √y = 4/3, so x = 27 × 4/3 = 36.