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
RE: In an examination a student must answer 65% ...
Dear Abhinav
Kindly note that after answering 7 questions correctly he got qualified. The selection criteria is 65 . Hence this 7 questions correct must be equal to or greater than 65 .
Hence the total no of question is 7/65 *100 10.8 questions. This is contradict with statement that he answered out of 14 questions.
RE: In an examination a student must answer 65% ...
Deall all The Answer is 20. Let me explain. What is asked is the min no. of questions .... so what we need to do is assuming that he answers every question from now on correctly we need to find the no. of questions. First let us take 18 . We find that 65 of 18 is 11.7. Out of the 18 questions he has finished answering 14 questions already out of which 7 is correct. So even if he answers the remaining 4 questions correctly he gets to only 61.11 .... So ans is not 18. Now let us take 20. 65 of 20 is 13 . 14 questions are already answered and 7 correct out of them. So remaining is 6 questions. And if he answers all the 6 questions correctly he gets to 7+6 13 which is the required to pass in the exam. So the min. no. of questions is 20. Hope u have understood.RgdsKarthik
