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Friday, 14 August 2026
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Mathematics Past Questions and Answers

Topic: Variation

Jamb Mathematics Questions - Variation

Question 11:
The inverse function f(x) = 3x + 4 is
  • A (x-4)/3
  • B (x-5)/5
  • C (x+3)/4
  • D (x+4)/3
View Answer & Explanation
Question 12:
The length a person can jump is inversely proportional to his weight. If a 20 kg person can jump 1.5 m, find the constant of proportionality
  • A 60
  • B 30
  • C 20
  • D 15
View Answer & Explanation
Question 13:
The weight W kg of a metal bar varies jointly as its length L meters and the square of its diameter d meters. If w = 140 when d = 42/3 and L = 54, find d in terms of W and L.
  • A \(\sqrt{\frac{42W}{5L}}\)
  • B \(\sqrt{\frac{6L}{42W}}\)
  • C \(\frac{42W}{5L}\)
  • D \(\frac{5L}{42W}\)
View Answer & Explanation
Question 14:
If x * y = x + y2, find then value of (2*3)*5
  • A 36
  • B 25
  • C 11
  • D 55
View Answer & Explanation
Question 15:
The inverse of matrix N = \(\begin{vmatrix} 2 & 3 \\
1 & 4\end{vmatrix}\) is
  • A \(\frac{1}{5}\) \(\begin{vmatrix} 2 & 1 \\ 3 & 4\end{vmatrix}\)
  • B \(\frac{1}{5}\) \(\begin{vmatrix} 4 & -3 \\ -1 & 2\end{vmatrix}\)
  • C \(\frac{1}{5}\) \(\begin{vmatrix} 2 & -1 \\ -3 & 4\end{vmatrix}\)
  • D \(\frac{1}{5}\) \(\begin{vmatrix} 4 & 3 \\ 1 & 2\end{vmatrix}\)
View Answer & Explanation