Adam took an exam with 20 questions, and answered all of the 20 questions. He gets 5 points
for a right answer and 2 points taken off for a wrong answer. If Adam's score in the exam is
between 45 and 80 exclusive, what is the difference between the maximum possible number of
right answers (M) and minimum possible number of right answers (m)?
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Assume that the student had answered all questions correctly. So marks scored = 75 x 4= 300. If he answer 1-
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