# Mathematics 2020 Past Questions | WAEC

Study the following Mathematics past questions and answers for JAMBWAEC  NECO and Post-JAMB. Get prepared with official past questions and answers for upcoming examinations.

31. In the diagram, PS¯/SR¯, PS¯/TR¯, QS¯/UR¯, PS¯= 15cm, SR¯= 8cm, PS¯ = 10cm and area of △ SUR = 24cm2. Calculate the area of PTRS.

• A. 40 cm2
• B. 48 cm2
• C. 80 cm2

D. 120 cm2

32. In the diagram, PQR is a circle with centre O. If < OPQ = 48o, find the value of m

• A. 96o
• B. 90o
• C. 68o
• D. 42o

33. The pie chart shows the population of men, women, and children in a city. If the population of the city is 1,800,000, how many men are in the city? • A. 845,000
• B. 600,000
• C. 355,000

D. 250,000

34. The mean of the numbers 15, 21, 17, 26, 18, and 29 is 21. Calculate the standard deviation

• A. 9
• B. 6
• C. 5
• D. 0

35. In the diagram, O is the centre of the circle. SOQ is the diameter and < SRP = 37o. Find < PSQ. • A. 127o
• B. 65o
• C. 53o
• D. 37o

36. Find the sum of the interior angle of a pentagon.

• A. 340o
• B. 350o
• C. 540o
• D. 550o

37. The diameter of a sphere is 12 cm. Calculate, correct of the nearest cm3, the volume of the sphere, [Take π=22/7]

• A.
903 cm3
• B. 904 cm3
• C. 905 cm3
• D. 906 cm3

38.  A box contains 12 identical balls of which 5 are red, 4 blue, and the rest are green.  If a ball is selected at random from the box, what is the probability that it is green?

• A. 3/4
• B. 1/2
• C. 1/3
• D. 1/4

39. A box contains 12 identical balls of which 5 are red, 4 blue, and the rest are green. If two balls are selected at random one after the other with replacement, what is the probability that both are red?

• A. 25/144
• B. 5/33
• C. 5/6
• D. 103/132

40. In the diagram PQ is a straight line. If m = 1/2(x + y + z), find value of m.

• A. 45o
• B. 60o
• C. 90o
• D. 100o

41.

 x 6.2 6.85 7.5 y 3.9 5.2 6.5

The points on a linear graph are as shown in the table. Find the gradient (slope) of the line.

• A. 2 1/2
• B. 2
• C. 1
• D. 1/2

42. In the diagram, O is the centre of the circle, PQ¯and RS¯are tangents to the circle. Find the value of (m + n).

• A. 120o
• B. 90o
• C. 75o
• D. 60o

43. Which of the following is not a sufficient condition for two triangles to be congruent?

• A. AAS
• B. SSS
• C. SAS
• D. SSA

44. A woman received a discount of 20% on a piece of cloth she purchased from a shop. If she paid $525.00, what was the original price? • A.$675.25
• B. $660.25 • C.$656.25
• D. \$616.25

45. The interquartile range of distribution is 7. If the 25th percentile is 16, find the upper quartile.

• A. 35
• B. 30
• C. 23
• D. 9
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