Question:A number, on subtracting `15` from it, reduces to its `80%.` What is `40%` of that number ? 

A `60` 
B `45` 
C `30` 
D `90` 

+ Answer
C 

+ Explanation
`x - 15`

`= (80)/(100) x ⇒ x - 15`

`= (4)/(5) x ⇒ x - (4)/(5) x = 15`

`:. x/5 = 15`

`or x = (15 xx 5)`

`= 75.`

Now,`40%` of `75`

`= (40/100 xx 75)`

`= 30`

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Irin Moni

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