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Wednesday, 22 April 2026
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Mathematics Past Questions and Answers

Jamb 2015 Mathematics Questions

Question 81:
Make x the subject of the equation
s = 2 + \(\frac{t}{5} \)(x + 3/5y)
  • A X = 5[(s − 2) ÷ t] + 3yt
  • B X = 25[(s − 2) ÷ t] − 3ty
  • C X = [1 ÷ (s − 2)3ty]
  • D X = [5(s − 2) 2 ÷ 3ty] x t
View Answer & Explanation
Question 82:
If log520 = x, find x
  • A 1.761
  • B 1.354
  • C 1.861
  • D 2.549
View Answer & Explanation
Question 83:
Find at which rate per annum simple interest N525 will amount to N588 in 3 years.
  • A 3%
  • B 2%
  • C 5%
  • D 4%
View Answer & Explanation
Question 84:
Find the range of values of t which satisfies the inequality.
2t − 1 \(\leq\) 3 and 2− t \(\geq\) 5
  • A -3 \(\leq\) t \(\leq\) 1
  • B -2 \(\leq\) t \(\leq\) 3
  • C -3 \(\leq\) t \(\leq\) 4
  • D -3 \(\leq\) t \(\leq\) 2
View Answer & Explanation
Question 85:
Given that A = {1, 5, 7}
B = {3, 9, 12, 15}
C = {2, 4, 6, 8}
Find (A ∪ B) ∪ C
  • A {1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15}
  • B {1, 2, 3, 5, 6, 8, 12, 15}
  • C {2, 4, 5, 9, 12, 15}
  • D {1, 5, 6, 7, 8, 9, 12, 15}
View Answer & Explanation