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In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 75 questions and secures 125 marks, the number of questions he attempts correctly, is ?

35
40
42
46
Explanation:

Let the number of correct answers be x.

Then numbers of incorrect answers will be 75 - x

We get 4x - (75 - x) × 1 = 125

On solving the equation we get x= 40.

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