Waec Mathematics Past Questions For Year 2020
Question 11
Solve 3x - 2y = 10 and x + 3y = 7 simultaneously
- A. x = -4 and y = 1
- B. x = -1 and y = -4
- C. x = 1 and y = 4
- D. x = 4 and y = 1
Question 12
If x = 3 and y = -1, evaluate 2(x\(^2\) - y\(^2\))
- A. 24
- B. 22
- C. 20
- D. 16
Question 13
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 cm\(^2\)
- B. 166 cm\(^2\)
- C. 140 cm\(^2\)
- D. 83 cm\(^2\)
Question 14
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
Question 15
Given that x is directly proportional to y and inversely proportional to Z, x = 15 when y = 10 and Z = 4, find the equation connecting x, y and z
- A. x = \(\frac{6y}{z}\)
- B. x = \(\frac{12y}{z}\)
- C. x = \(\frac{3y}{z}\)
- D. x = \(\frac{3y}{2z}\)
