Question:The number which when decreased by `27 1/2%` gives `87,` is : 

A `120` 
B `110` 
C `135` 
D `58` 

+ Answer
A 

+ Explanation
`(100 - 27 1/2)% x`

` = 87 ⇒ 72 1/2% of x` 

`= 87`

`:. 145/(2 xx 100) xx x = 87`

`or x = (87 xx 200)/(145)`

`= 120.`

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Irin Moni

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