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Friday, 14 August 2026
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Mathematics Past Questions and Answers

Topic: Variation

Jamb Mathematics Questions - Variation

Question 1:
After getting a rise of 15%, a man's new monthly salary is N345. How much per month did he earn before the increase?
  • A N330
  • B N396.75
  • C N300
  • D N293.25
  • E N360
View Answer & Explanation
Question 2:
y is inversely proportional to x and y and 6 when x = 7. Find the constant of the variation
  • A 47
  • B 42
  • C 54
  • D 46
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Question 3:
If N = \(\frac{p}{2}\)(\(\frac{T_1 - T_2}{T_1}\)). Find P when N = 12, T1 = 27 and T2 = 24.
  • A 48
  • B 108
  • C 54
  • D 216
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Question 4:
P varies jointly as m and u, and varies inversely as q. Given that p = 4, m = 3 and u = 2 and q = 1, find the value of p when m = 6, u = 4 and q =\(\frac{8}{5}\)
  • A 12\(\frac{8}{5}\)
  • B 15
  • C 10
  • D 28\(\frac{8}{5}\)
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Question 5:
Find the inverse \(\begin{pmatrix} 5 & 3 \\ 6 & 4 \end{pmatrix}\)
  • A \(\begin{vmatrix} 2 & -\frac{3}{2} \\ -3 & -\frac{5}{2} \end{vmatrix}\)
  • B \(\begin{vmatrix} 2 & -\frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
  • C \(\begin{vmatrix} 2 & \frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
  • D \(\begin{vmatrix} 2 & \frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
View Answer & Explanation