Question:If`.5x = 0.04y`,then the value of `((y - x)/(y + x))` is : 

A `730/77` 
B `73/77` 
C `7.3/77` 
D None 

+ Answer
B 

+ Explanation
`x/y = 0.04/1.5`

`= 4/100 = 2/75`.

`:. (x - y)/(x + y) =(1- x/y)/(1 + x/y)`

`= (1 - 2/75)/(1 + 2/75)`

`= 73/77`

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Irin Moni

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