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2. In an examination a student must answer 65% of the
questions correctly. But it was found that 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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Answer Posted / abhisek das
(C) Out of 14 questions 7 are correct and he requires 65%
to pass.
As per the question to qualify he has to answer rest all
questions correctly
Let there are ?X? questions left in the paper so he has to
answer all ?X? questions to qualify.
Hence,
(7 + X)/(14 + X)=65/100
Solving we get X = 6
So the minimum number of questions in the paper is
14 + X =14 + 6 =20
| Is This Answer Correct ? | 6 Yes | 1 No |
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