In an exam, each answer fetches one mark and for each wrong answer, there is a penalty of one- fourth mark. 80% of the questions attempted by a student are right and he scored 60 marks. What is the number of questions he answered correctly?
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sorry...don't know really.. question is very difficult
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let total no. of ques. be 100
ques. attempted correctly= 80
wrong ques. =20
thus ,marks scored=80×1-20×0.25
=75
therefore,when total ques.is 100, marks scored 75
but total marks scored are 60,thus from unitary method total no. of ques. are 80
80%of 80 ques. =64
therefore,correctly answered ques. = 64
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