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.

16. Two buses start from the same station at 9.00am and travel in opposite directions along the same straight road. The first bus travel at a speed of 72 km/h and the second at 48 km/h. At what time will they be 240km apart?

  • A. 1:00 pm
  • B. 12:00 noon
  • C. 11:00 am
  • D. 10:00 am

17. A solid cuboid has a length of 7 cm, a width of 5 cm, and a height of 4 cm. Calculate its total surface area.

  • A. 280 cm2
  • B. 166 cm2
  • C. 140 cm2
  • D. 83 cm2

18. In the diagram, PQ//SR.  Find the value of x. 

  • A. 34
  • B. 46
  • C. 57
  • D. 68

19. Find the equation of the line parallel to 2y = 3(x – 2) and passes through the point (2, 3) 

  • A. y = 2/3x−3
  • B. y = 2/3 x−2
  • C. y = 2/3 x
  • D. y = − 2/3x

20.The expression will be undefined when 5x+3/6x(x+1) equals 

  • A. {0, 1}
  • B. {0, -1}
  • C. {-3, -11}
  • D. {-3, 0}

21. A man is five times as old as his son. In four years’ time, the product of their ages would be 340. If the son’s age is y, express the product of their ages in terms of y.

  • A. 5y2−16y−380=0
  • B. 5y2−24y−380=0
  • C. 5y2−16y−330=0
  • D. 5y2−24y−324=0

21. Simplify; \(\frac{a}{b} – \frac{a}{a} – \frac{c}{b}\)

  • A. \(\frac{a – b + c}{ab}\)
  • B. \(\frac{ab – bc – ac}{ab}\)
  • C. \(\frac{a^2 – b^2 + ac}{ab}\)
  • D. \(\frac{a^2 – b^2 – ac}{ab}\)

23. In the diagram, XYZ is an equilateral triangle of side 6cm and Y is the midpoint of XY¯. Find tan (< XZT) 

  • A. -1/√3
  • B. 3/√2
  • C. √3
  • D. 1/2

24. A fence 2.4 m tall, is 10m away from a tree of height 16m. Calculate the angle of elevation of the top of the tree from the top of the fence. 

  • A. 76.11o
  • B. 53.67o
  • C. 52.40o
  • D. 51.32o

25. Fati buys milk at ₦x per tin sells each at a profit of ₦y. If she sells 10 tins of milk, how much does she receives from the sales?

  • A. ₦(xy + 10)
  • B. ₦(x + 10y)
  • C. ₦(10x + y)
  • D. ₦10(x + y)

26. If tan y is positive and sin y is negative, in which quadrant would y lie? 

  • A. First and third only
  • B. First and second only
  • C. Third only
  • D. Second only

27. The dimension of a rectangular base of a right pyramid is 9 cm by 5cm. If the volume of the pyramid is 105 cm3, how high is the pyramid? 

  • A. 10cm
  • B. 6cm
  • C. 8cm
  • D. 7cm

28. Each interior angle of a regular polygon is 168o. Find the number of sides of the polygon 

  • A. 30
  • B. 36
  • C. 24
  • D. 18

29. In the diagram, MN¯//PQ¯, < MNP = 2x, and < NPQ = (3x – 50)o. Find the value of < NPQ 

  • A. 200o
  • B. 150o
  • C. 120o
  • D. 90o

30. The length of an arc of a circle of radius 3.5 cm is  1 19/36 Calculate, correct to the nearest degree , the angle substended by the centre of the circle. [Take π=22/7] 

  • A. 55o
  • B. 36o
  • C. 25o
  • D. 22o
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