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Evaluate (0.42 ÷ 2.5)/(0.5 x 2.05), leaving...
waec-2019 ssce-exam-2019 waec-mathematics-2019 math
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Evaluate (0.42 ÷ 2.5)/(0.5 x 2.05), leaving the answer in standard form

A. 1.629 x 102

B. 1.6639 x 101

C. 1.639 x 10-1

D. 1.639 x 10-2

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peter
Asked by peterrep:1.6K
University of Lagos Nigeria
03 May 2020

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1 answer(s)


judziy
Judziy answeredrep:1.8K
University of Benin Nigeria
20 July 2020
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First, convert decimal to fraction

0.42 = 42/100

2.5 = 2 5/10 = 25/10

0.5 = 5/10

2.05 = 2 5/100 = 205/100

For the numerator,

0.42 ÷ 2.5 = 42/100 ÷ 25/10

= 42/100 x 10/25

= 21/125

Denominator:

0.5 x 2.05 = 5/10 x 205/100

= 41/40

Therefore,

21/125 ÷ 41/40

21/125 x 40/41

= 840/5125

= 0.1639

= 1.639 x 10-1

Ans C

 

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