Mathematics questions and answers

Mathematics Questions and Answers

How good are you with figures and formulas? Find out with these Mathematics past questions and answers. This Test is useful for both job aptitude test candidates and students preparing for JAMB, WAEC, NECO or Post UTME.

2,046.

A man kept 6 black, 5 brown and 7 purple shirts in a drawer. What is the probability of his picking a purple shirt with his eyes closed?

A.

\(\frac{1}{7}\)

B.

\(\frac{11}{18}\)

C.

\(\frac{7}{18}\)

D.

\(\frac{7}{11}\)

Correct answer is C

Prob. of purple shirt is \(\frac{7}{18}\)

2,047.

Find the probability that a number selected at random from 40 to 50 is a prime

A.

\(\frac{5}{11}\)

B.

\(\frac{5}{11}\)

C.

\(\frac{3}{11}\)

D.

\(\frac{4}{11}\)

Correct answer is C

From 40 to 50 = these number are prime i.e. 41, 43, 47

prob. of selecting a prime No. is \(\frac{3}{11}\)

2,048.

Find the median of the numbers 89, 141, 130, 161, 120, 131, 131, 100, 108 and 119

A.

131

B.

125

C.

123

D.

120

Correct answer is B

Explanation
Arrange in ascending order

89, 100, 108, 119, |120, 130|, 131, 131, 141, 161

Median = \(\frac{120 + 130}{2}\)

= 125

2,050.

An open rectangular box externally measures 4m x 3m x 4m. Find the total cost of painting the box externally if it costs N2.00 to paint one square meter

A.

N96.00

B.

N112.00

C.

N136.00

D.

N160.00

Correct answer is B

Total surface area(s) = 2(4 x 3) + 2(4 x 4)

= 2(12) + 2(16)

= 24 + 32

= 56cm2

1m2 costs N2.00

∴ 56m∴ will cost 56 x N2.00

= N112.00