Inequalities - Jamb Mathematics Past Questions and Answers

Question 21:

• JAMB 1987

A train moves from P to Q at an average speed of 90km/h and immediately returns from Q to P through the same route at an average speed of 45km/h. Find the average speed for the entire journey

A. 55.00km/h
B. 60.00km/h
C. 67.50km\h
D. 75.00km\h

Question 22:

• JAMB 1987

An (n - 2)² sided figure has n diagonals. Find the number n diagonals for 25-sided figure

A. 7
B. 8
C. 9
D. 10

Question 23:

• JAMB 1987

Solve the inequality x - 1 > 4(x + 2)

A. X > -3
B. X < -3
C. 2 < x < 3
D. -3 < x < -2

Question 24:

• JAMB 1988

List the integral values of x which satisfy the inequality -1 < 5 - 2x \(\geq\) 7

A. -1, 0, 1, 2
B. 0, 1, 2, 3
C. -0, 1, 2, 3
D. -1, 0, 2, 3

Question 25:

• JAMB 1989

find the range of values of values of r which satisfies the following inequality, where a, b and c are positive \(\frac{r}{a}\) + \(\frac{r}{b}\) + \(\frac{r}{c}\) > 1

A. R > \(\frac{abc}{bc + ac + ab}\)
B. R < abc
C. R > \(\frac{1}{a}\) + \(\frac{1}{b}\) + \(\frac{1}{c}\)
D. . \(\frac{1}{abc}\)