In an examination ,a candidates gets 4 marks for a correct answer and -1 for a wrong answer .If a candidate attempts 35 questions and obtains 100 marks, find the number of questions answered correctly by the candidate.
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For correct answer = 4marks Let x= Number of correct answers
For wrong answer = -1 mark (35-x)= Number of wrong answers
As total number of questions are 35;
Total Score = x(4) + (35-x)(-1)=100
4x- 35 + x= 100
5x = 135
x = 27 (Number of correct answers)
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