A student appeared in an examination. If he gives a correct answer he scores 4 marks, if he gives a wrong answer he loses 1 mark. If he attempted all 75 questions and got 125 marks, how many questions he attempted correctly?

Explanation

Let the number of correct answers be x. Number of incorrect answers is (75 − x). Then 4x − (75 − x) = 125 or x = 40

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