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JAMB Mathematics 2011 Question 17

Question 17

Variation

T varies inversely as the cube of R. When R = 3, T = 2/81, find T when R = 2.

  1. A.1/18
  2. B.1/12
  3. C.1/24
  4. D.1/6
Show the answer and explanation

Answer: B (1/12)

Explanation

T = k/R3: k = 2/81 × 27 = 2/3. When R = 2, T = (2/3)/8 = 1/12.