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 secure 125 marks, the number of questions be attempted correctly, is
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Answer:
40
Step-by-step explanation:
If the number of correct answer be x, then
the number of incorrect answer is (75x).
∴4x−(75−x)=125orx=40
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