WAEC 2020 Mathematics Theory & Objective Expo/Answer/Runs Is Now Available


Mathematics Answer

(1a)
Given A={2,4,6,8,...}
         B={3,6,9,12,...}
         C={1,2,3,6}
         U= {1,2,3,4,5,6,7,8,9,10}

A' = {1,3,5,7,9}
B' = {1,2,4,5,7,8,10}
C' = {4,5,7,8,9,10}
A'nB'nC' = {5, 7}

(1b) 
Cost of each premiere ticket = $18.50
At bulk purchase, cost of each = $80.00/50 = $16.00

Amount saved = $18.50 - $16.00
=$2.50

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11b)  8y = - 4x + 24

Y = - 4/8 x + 24/8 

Y = - 1/2 x + 3

Gradient = m = - 1/2

:. Y- y1 = m(x-x)

Y- 12 = 1/2 (x + 8)

2(y-12) = 1 (x+8)

2y - 24 = -x-8

X + 2y - 24 + 8 = 0

X + 2y - 24 + 8 = 0

X + 2y - 16 = 0 

Is the line above 

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8a) Cost price = Ghd
150

Let the number of plates
be X profit per one = 1
GHd

Total profit = 6 GHd

Remaining plates = x - 4

Total profit = (x - 4)
1Ghd

6 = x - 4

X = 6 + 4

X = 10


The number of plates is
10

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