Mathematics Exam Past Questions and Answers | JAMB, WAEC and NECO

Mathematics looks at measurement, relationships, and properties of numbers and groups using numbers and symbols. Important topics in math include arithmetic, algebra, geometry, and calculus.

• Question 1481: If y = x cos x, find dy/dx Options:
  A) sin x - x cos x
  B) sin x + x cos x
  C) cos x + x sin x
  D) cos x - x sin x
  Show Answer
  The correct answer is D .
• Question 1482:

  If the mean of 4, y, 8 and 10 is 7. Find y?

  Options:
  A) 6
  B) 10
  C) 7
  D) 9
  Show Answer
  The correct answer is A .
• Question 1483: A student blows a balloon and its volume increases at a rate of $\pi$(20 - t²)cm³S^-1 after t seconds. If the initial volume is 0 cm³, find the volume of the balloon after 2 seconds Options:
  A) 37.00$\pi$
  B) 37.33$\pi$
  C) 40.00$\pi$
  D) 42.67$\pi$
  Show Answer
  The correct answer is B .
• Question 1484: The scores of 16 students in a Mathematics test are 65, 65, 55, 60, 60, 65, 60, 70, 75, 70, 65, 70, 60, 65, 65, 70. What is the sum of the median and modal scores? Options:
  A) 125
  B) 130
  C) 140
  D) 150
  E) 137.5
  Show Answer
  The correct answer is B .
• Question 1485: if a = -3, b = 2, c = 4, evaluate $\frac{a^3-b^3-c^{\frac{1}{2}}}{b-a-c}$ Options:
  A) 37
  B) $\frac{-37}{5}$
  C) $\frac{37}{5}$
  D) -37
  Show Answer
  The correct answer is A .
• Question 1486: Find correct to two decimals places 100 + $\frac{1}{100}$ + $\frac{3}{1000}$ + $\frac{27}{10000}$ Options:
  A) 100.02
  B) 1000.02
  C) 100.22
  D) 100.01
  E) 100.51
  Show Answer
  The correct answer is A .
• Question 1487: When a dealer sells a bicycle for ₦81 he makes a profit of 80%. What did he pay for the bicycle? Options:
  A) ₦73
  B) ₦74.52
  C) ₦75
  D) ₦87.48
  E) ₦75.52
  Show Answer
  The correct answer is C .
• Question 1488: 3y = 4x - 1 and Ky = x + 3 are equations of two straight lines. If the two lines are perpendicular to each other, find K. Options:
  A) -4/3
  B) -3/4
  C) 3/4
  D) 4/3
  Show Answer
  The correct answer is A .
• Question 1489:

  Determine the mean monthly salary of 50 employees of a company from the following frequency distribution.

  $\begin{array}{cc}\text{Monthly salary}& \text{Frequency}\\ N200.00& 10\\ N325.00& 5\\ N100.00& 20\\ N120.00& 2\\ N60.00& 10\\ N80.00& 3\end{array}$

  Options:
  A) ₦215.30
  B) ₦134.10
  C) ₦143.10
  D) ₦80.00
  E) ₦50.30
  Show Answer
  The correct answer is B .
• Question 1490: If 2log₃ y + log₃ x² = 4, then y is Options:
  A) 4 - log₃
  B) $\frac{4}{lo{g}_{3}x}$
  C) $\frac{4}{x}$
  D) $\pm$ $\frac{9}{x}$
  Show Answer
  The correct answer is D .