A test contains 10 questions.A correct answer awards 2 marks.A wrong answer gets -1 Mark.A question which is not answered awards 0 marks.A student attempts 7 questions and get 8 marks.How many questions did the student answer correctly?
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Step-by-step explanation:
Number of questions attempted = 7
Total score = 8
Find the number of questions answered correctly.
We know that,
- if 2 marks are awarded for correct answer so total must be an even number.
- if -1 is given for wrong answer then the answer must be in negative.
So, now, the answer is an even number which is 8.
8 / 2 = 4
Answer => The student answered 4 out of 7 questions correctly.
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