Question

    A student gets +3 marks for each right answer and - 0.5

    mark for each wrong answer in an exam, which consists 250 question. If the student gets 477 exam marks, find the number of wrong questions attempted by him?
    A 78 Correct Answer Incorrect Answer
    B 67 Correct Answer Incorrect Answer
    C 125 Correct Answer Incorrect Answer
    D 45 Correct Answer Incorrect Answer

    Solution

    Let all the right answer be 250 and also the wrong answer be 250. Right answer : wrong answer = 86 : 39  ∴ Number of wrong questions attempted = 39/(86+39)  × 250 = 78

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