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What number, when added to the numerator and to the denominator of  5/8 , results in a fraction whose value is 0.4?

 Nov 2, 2019

Best Answer 

 #1
avatar+22096 
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-3   added to numerator   2

-3  added to denominator 5

 

2/5 = .4

 

(5+x) / (8+x) = 4/10

5+x = (8+x) (4/10)

5 + x = 32/10 + 4/10x

1.8 = -6/10 x

1.8 (-10/6) = x

-18/6 = x

x = -3

 Nov 2, 2019
edited by Guest  Nov 2, 2019
 #1
avatar+22096 
0
Best Answer

-3   added to numerator   2

-3  added to denominator 5

 

2/5 = .4

 

(5+x) / (8+x) = 4/10

5+x = (8+x) (4/10)

5 + x = 32/10 + 4/10x

1.8 = -6/10 x

1.8 (-10/6) = x

-18/6 = x

x = -3

ElectricPavlov Nov 2, 2019
edited by Guest  Nov 2, 2019

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