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Monday, 02 November 2026
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Mathematics Past Questions and Answers

Jamb 1981 Mathematics Questions

Question 1:
Suppose x varies inversely as y, y varies directly as the square of t and x = 1, when t = 3. Find x when t = \(\frac{1}{3}\).
  • A 81
  • B 27
  • C \(\frac{1}{9}\)
  • D \(\frac{1}{27}\)
  • E \(\frac{1}{81}\)
View Answer & Explanation
Question 2:
If sine x equals cosine x, what is x in radians?
  • A \(\frac{\pi}{2}\)
  • B \(\frac{\pi}{3}\)
  • C \(\frac{\pi}{4}\)
  • D \(\frac{\pi}{6}\)
  • E \(\frac{\pi}{12}\)
View Answer & Explanation
Question 3:
The ratio of the price of a loaf of bread to the price of a packet of sugar in 1975 was r : t. In 1980, the price of a loaf went up by 25% and that of a packet of sugar went up by 10%. Their new ratio is now
  • A 40r:50t
  • B 44r : 50t
  • C 50r : 44t
  • D 44r:55t
  • E 55r:44t
View Answer & Explanation
Question 4:
Find a two-digit number such that three times the tens digit is 2 less than twice the units digit and twice the number is 20 greater than the number obtained by reversing the digits
  • A 24
  • B 42
  • C 74
  • D 47
  • E 72
View Answer & Explanation
Question 5:
Find the value of x satisfying \(\frac{x}{2}\) - \(\frac{1}{3}\) < \(\frac{2x}{5}\) + \(\frac{1}{6}\)
  • A X < 5
  • B X < 7\(\frac{1}{2}\)
  • C X > 5
  • D X > 7\(\frac{1}{2}\)
View Answer & Explanation