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Math Help - another puzzle

  1. #1
    Junior Member
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    another puzzle

    17 In an examination a student must answer 65% of the questions
    correctly. But it was found t hat after answer 7 questions corretly out of the
    first 14, the student qualified. What is the min no. of questions in
    the paper. (a) 22 (b) 18 (c) 20 (d) Can't say
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  2. #2
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    Quote Originally Posted by bharathlece
    17 In an examination a student must answer 65% of the questions
    correctly. But it was found t hat after answer 7 questions corretly out of the
    first 14, the student qualified. What is the min no. of questions in
    the paper. (a) 22 (b) 18 (c) 20 (d) Can't say
    It is not possible, assume the worst case senario. That he answer 7 out of the first 14 and did not the rest. Then it is,
    \frac{7}{n} where n is at least 14. In the best case senario (for the worst case) n=14 which is \frac{7}{14}=50% failure thus there is no answer.
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  3. #3
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    tahnk u

    u really solved it briliantly.
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