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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.

141.

The age (years) of some members in a singing group are: 12, 47, 49, 15, 43, 41, 13, 39, 43, 41 and 36.

Find the lower quartile

A.

12

B.

13

C.

15

D.

20

Correct answer is C

Rearranged: 12,13,15, 36, 39, 41, 41, 43, 43, 47 and 49

Lower quartile or First quartile = totalnumberofitems4

If odd: items numbers + 1 → 11items+14

124

Lower quartile = 3rd iems →15

142.

Solve y+24y13 > 1

A.

y < -10

B.

y < -2

C.

y < 2

D.

y < 10

Correct answer is B

multiply both sides by the LCM

12 x y+24 -  12 x y13 >12 x 1

3[y+2] - 4[y-1] > 12

3y + 6 - 4y + 4 > 12

-y + 2 > 12

-y > 12 - 10 = 2

y < -2

143.

In the diagram, triangle MNR is inscribed in circle MNR, and line PQ is a straight line. ∠MRN = 41 and = 141, find ∠QNR

A.

39º

B.

80º

C.

110º

D.

141º

Correct answer is B

The exterior angle theorem states that the measure of each exterior angle of a triangle is equal to the sum of the opposite and non-adjacent interior angles. ∠M = ∠R + ∠N → 141 = 41 + ∠N ∠N = 141 - 41 = 100º ∠QNR = 180 - 100 → 80º

144.

Simplify 218m21+3m

A.

2[1+3m]

B.

2[1-3m]

C.

2[1-3m2]

D.

2[1+3m2]

Correct answer is B

218m21+3m2[19m2]1+3m

2[13m][1+3m]1+3m

2[1-3m]

145.

The mean of a set of 10 numbers is 56. If the mean of the first nine numbers is 55, find the 10th number.

A.

75

B.

65

C.

55

D.

45

Correct answer is B

10th number must be over 56 (as it increases the average)

55 x 9 = 495 = sum of first 9 numbers

56 x 10 = 560 = sum of all 10 numbers

560 - 495 = 65 = 10th number