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Mathematics 2020 WAEC Past Questions

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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. 5y\(^2 - 16y - 380 = 0\)
  • B. 5y\(^2 - 24y - 380 = 0\)
  • C. 5y\(^2 - 16y - 330 = 0\)
  • D. 5y\(^2 + 24y - 324 = 0\)
View Answer & Discuss (2) WAEC 2020
22

Simplify; \(\frac{a}{b} - \frac{b}{a} - \frac{c}{b}\)

  • A. \(\frac{a - b + c}{ab}\)
  • B. \(\frac{ab - bc - ac}{ab}\)
  • C. \(\frac{a^2 - b^2 + ac}{ab}\)
  • D. \(\frac{a^2 - b^2 - ac}{ab}\)
View Answer & Discuss (10) WAEC 2020
23

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

  • A. \(\frac{1}{\sqrt{3}}\)
  • B. \(\frac{\sqrt{3}}{2}\)
  • C. \(\sqrt{3}\)
  • D. \(\frac{1}{2}\)
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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. 76.11\(^o\)
  • B. 53.67\(^o\)
  • C. 52.40\(^o\)
  • D. 51.32\(^o\)
View Answer & Discuss WAEC 2020
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)
View Answer & Discuss WAEC 2020
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