Waec Mathematics 2012 Past Questions and Answers

Question 21:

• WAEC 2012

A bag contains 4 red and 6 black balls of the same size. If the balls are shuffled briskly and two balls are drawn one after the other without replacement, find the probability of picking balls of different colours

A. \(\frac{8}{15}\)
B. \(\frac{13}{25}\)
C. \(\frac{11}{15}\)
D. \(\frac{13}{15}\)

Question 22:

• WAEC 2012

Which of these statements about y = 8\(\sqrt{m}\) is correct?

A. Log y = log 8 x log \(\sqrt{m}\)
B. Log y = 3 log 2 x \(\frac{1}{2}\) log m
C. Log y = 3 log 2 - \(\frac{1}{2}\) log m
D. Log y = 3 log 2 + \(\frac{1}{2}\) log m

Question 23:

• WAEC 2012

If x + 0.4y = 3 and y = \(\frac{1}{2}\)x, find the value of (x + y)

A. 1\(\frac{1}{4}\)
B. 2\(\frac{1}{2}\)
C. 3\(\frac{3}{4}\)
D. 5

Question 24:

• WAEC 2012

Express 3 - [\(\frac{x - y}{y}\)] as a single fraction

A. \(\frac{3xy}{y}\)
B. \(\frac{x - 4y}{y}\)
C. \(\frac{4y - x}{y}\)
D. 3 - \(\frac{x - y}{y}\)

Question 25:

• WAEC 2012

If p = {prime factors of 210} and Q = {prime less than 10}, find p \(\cap\) Q

A. {1,2, 3}
B. {2, 3, 5}
C. {1, 3, 5,7}
D. {2,3,5,7}