Question:In an examination , a student scores `4`marks for every correct answar and loses `1`mark for every wrong answar.If he attempts all `75` question and secures `125`marks, the number of question he attempts correctly,is : 

A `35` 
B `40` 
C `42` 
D `46` 

+ Answer
B 

+ Explanation
Let the number of correct answars be x,

Number of incorrect answars

`= (75 - x)`.

`4x - (75 - x) = 125`

`or 5x = 200`

`or x = 40`.

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Irin Moni

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