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Question
In a computerised test of 50 questions, for each correct answer, 1 mark is awarded, and for each wrong answer, 0.25 marks are deducted. If a student answered the first 35 questions correctly, how many more questions from the remaining 15 should he answer correctly to score 80% given that he attempted all questions?
In a computerised test of 50 questions, for each correct answer, 1 mark is awarded, and for each wrong answer, 0.25 marks are deducted. If a student answered the first 35 questions correctly, how many more questions from the remaining 15 should he answer correctly to score 80% given that he attempted all questions?
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Solution
The correct option is B 7
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