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Question

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 scores 125 marks, how many questions did he answer correctly?

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Solution

Letthenumberofcorrectanswersbex,Wronganswers=75x,Given,totalmarks=4×x1×(75x)=1255x75=125,x=40

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