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WAEC Mathematics 2020 Paper

Question : 5

Total: 48

If 101

_{\text{two}}

_{\text{five}}

. Find the value of y

Solution:

012 + 01 = 01

101 $_{2}$ + 12 $_{y}$ = 2.3 $_{5}$

1 x 2 $^{o}$ + 0 x 2 $^{o}$ + 1 x2 $^{2}$ + 1 x y $^{o}$ + 2 x y $^{1}$ = 3 x 5 $^{o}$ + 3 x 5 $^{1}$

1 + 4 + 1 + 2y = 3 + 15

6 + 2y = 18

2y = 18 - 6

$\frac{2y}{2} = \frac{12}{2}$

y = 6

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