Jamb Mathematics 1980 Past Questions and Answers

Question 6:

• JAMB 1980

Rationalize the denominator of the given expression \(\frac{\sqrt{1 + a} - \sqrt{a}}{1 + a + \sqrt{a}}\)

A. 1 + 2a - 2\(\sqrt{a(1 + a)}\)
B. \(\sqrt{1(1 + a)}\)
C. 2a - 2\(\sqrt{a(1 + a)}\)
D. 1 + 2a - 2\(\sqrt{a + b}\)

Question 7:

• JAMB 1980

When a dealer sells a bicycle for N81 he makes a profit of 80%. What did he pay for the bicycle?

A. N73
B. N74.52
C. N75
D. N87.48
E. N75.52

Question 8:

• JAMB 1980

The median of the set of numbers 4, 9, 4, 13, 7, 14, 10, 17 is

A. 13
B. 7
C. \(\frac{19}{2}\)
D. \(\frac{39}{4}\)
E. 10

Question 9:

• JAMB 1980

List all integer values of x satisfying the inequality -1 < 2x - 5 \(\leq\) 5

B. 3, 4, 5
C. 2, 3, 4
D. 3, 4

Question 10:

• JAMB 1980

Find the roots of the equation 10x² - 13x - 3 = 0

A. X = \(\frac{3}{5}\) or -\(\frac{1}{2}\)
B. X = \(\frac{3}{10}\) or -1
C. X = \(\frac{3}{10}\) or 1
D. X = \(\frac{1}{5}\) or \(\frac{-3}{2}\)
E. X = -\(\frac{1}{5}\) or \(\frac{3}{2}\)