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    Question

    If a student scores 30% marks then he is failed by 50

    marks, but when he scores 50% marks then he is passed by 30 marks. Find the passing %?
    A 42.5% Correct Answer Incorrect Answer
    B 33(1/3)% Correct Answer Incorrect Answer
    C 37.5% Correct Answer Incorrect Answer
    D 45% Correct Answer Incorrect Answer
    E 40% Correct Answer Incorrect Answer

    Solution

    Let the Total marks be x According to the question, 30% of x + 50 = 50% of x -30 30x/100+ 50 = (50x/100) - 30 20x/100 = 80 x = 400 Passing marks = 30% of 400 + 50 = 120 + 50 = 170 Passing Percentage = (170/400) × 100 = 42.5%

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