Question:If `x/y = 4/5`, the value of `(5/8 + (y - x)/(y + x))`is 

A `49/72` 
B `53/72` 
C `23/72` 
D None of these 

+ Answer
B 

+ Explanation
`(5/8 + (y - x)/(y + x))`

`= (5/8 + (1 - x/y)/(1 + x/y))`

`= (5/8 + (1 - 4/5)/(1 + 4/5))`

`= 5/8 + ((1∕5))/((9∕5))`

`= (5/8 + 1/5 xx 5/9)`

`= 5/8 + 1/9)`

`= 3/72`

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Irin Moni

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