A test has 20 questions, with 4 marks for a correct answer, 1 mark fo

A test has 20 questions, with 4 marks for a correct answer, 1 mark for a wrong answer, and no marks for an unattempted question. A group of friends took the test. If all of them scored exactly 15 marks, but each of them attempted a different number of questions, what is the maximum number of (…)


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