Waec Mathematics 2005 Past Questions and Answers

Question 31:

• WAEC 2005

P = {3, 9, 11, 13} and Q = {3, 7, 9, 15} are subset of the universal set ξ = {1, 3, 7, 9, 11, 13, 15} find P^I ∩ Q^I

A. {3, 9}
B. {5, 7, 9}
C. {1}
D. {1, 11}

Question 32:

• WAEC 2005

A train moving at a uniform speed covers 36km in 21 minutes. How long does it take to cover 60km?

A. 35 mins
B. 40 mins
C. 45 mins
D. 90 mins

Question 33:

• WAEC 2005

The salary of a man was increased in the ratio 40:47. calculate the percentage increase in the salary

A. 85.1%
B. 58.5%
C. 17.5%
D. 14.9%

Question 34:

• WAEC 2005

A regular polygon has 9 sides. What is the size of one of its exterior angles?

A. 20^o
B. 40^o
C. 90^o
D. 140^o

Question 35:

• WAEC 2005

Simplify: \(\frac{2}{3xy} - \frac{3}{yz}\)

A. \(\frac{2-x}{12xyz}\)
B. \(\frac{2z-3x}{12xyz}\)
C. \(\frac{4z-3x}{12xyz}\)
D. \(\frac{8z-9x}{12xyz}\)