Waec Mathematics 1990 Past Questions and Answers

Question 16:

• WAEC 1990

In a class of 80 students, every students had to study economics or geography, or both economics and geography, if 65 students studied economics and 50 studied geography, how many studied both subjects?

A. 15
B. 30
C. 35
D. 45
E. 50

Question 17:

• WAEC 1990

The area shaded with horizontal lines is the solution set of the inequalities;

A. Y ≥ x, y + 3 ≥ 2x, x ≤ 3
B. Y ≤ x, y + 2x ≥ -3, x ≤ 3
C. Y ≤ -x, y + 2x ≤ 3, x ≥ -3
D. Y ≥ -x, y + 3 ≤ 2x, x ≥ -3
E. Y ≤ x, y ≤ 2x - 3, x ≥ 3

Question 18:

• WAEC 1990

the area shaded with vertical lines is the solution set of the inequalities;

A. Y ≤ x, y + 2x ≤ -3
B. Y ≥ x, y + 2x ≥ - 3
C. Y ≤ x, y < 2x - 3, x ≤ 3
D. Y ≤ -x, y ≤ 2x - 3, x ≤ 3
E. Y ≥ x, y + 2x ≥ 3, x ≤ 3

Question 19:

• WAEC 1990

In the diagram above, O is the center of the circle with radius 10cm, and ∠ABC = 30°. Calculate, correct to 1 decimal place, the length of arc AC [Take π = 22/7]

A. 5.2cm
B. 10.5cm
C. 13.2cm
D. 20.6cm
E. 31.4cm

Question 20:

• WAEC 1990

Factorize x\(^2\) + 4x - 192

A. (x-4) (x+48)
B. (x-48) (x+4)
C. (x-12) (x+16)
D. (x-12) (x-16)
E. (x+12) (x+16)