Question:Subtracting`40%` of a number from the number, we get the result as `30`. The number is : 

A `28` 
B `50` 
C `52` 
D `70` 

+ Answer
B 

+ Explanation
`x - 40%` of `x = 30 ⇒ x - (40)/(100) x`

`= 30 ⇒ x - (2)/(5) x = 30`

`:. (3x)/5 = 30`

`or x = (30 xx 5/3)`

`= 50.`

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Irin Moni

Editor, VCampus

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