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Monday, 02 November 2026
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Mathematics Past Questions and Answers

Jamb 1981 Mathematics Questions

Question 16:
By selling an article for N45.00 a man makes a profit of 8%. For how much should he have sold it in order to make a profit of 32%?
  • A N180.00
  • B N59.00
  • C N63.00
  • D N58.00
  • E N55.00
View Answer & Explanation
Question 17:
An isosceles triangle of sides 13cm, 13cm, 10cm is inscribed in a circle. What is the radius of the circle?
  • A 7cm
  • B 12cm
  • C 8cm
  • D 7cm
  • E 69cm
View Answer & Explanation
Question 18:
A micrometer is defined as one millionth of a millimeter. A length of 12,000 micrometres may be represented as
  • A 0.00012m
  • B 0.0000012m
  • C 0.000012m
  • D 0.00000012m
  • E 0.000000012m
View Answer & Explanation
Question 19:
In one and a half hours, the minute hand of a clock rotates through an angle of
  • A 90<sup style='font-size: smaller;'>o</sup>
  • B 180<sup style='font-size: smaller;'>o</sup>
  • C 640<sup style='font-size: smaller;'>o</sup>
  • D 450<sup style='font-size: smaller;'>o</sup>
  • E 540<sup style='font-size: smaller;'>o</sup>
View Answer & Explanation
Question 20:
Simplify \(\frac{\sqrt{2}}{\sqrt{3} - \sqrt{2}}\) - \(\frac{3 - 2}{\sqrt{3} + \sqrt{2}}\)
  • A 2\(\sqrt{2} - \sqrt{3}\)
  • B 3(\(\sqrt{6}\) - 1)
  • C \(\sqrt{6}\) - 3
  • D -\(\frac{1}{2}\)
  • E \(\frac{-\sqrt{3}}{\sqrt{2} - \sqrt{2}}\)
View Answer & Explanation