David is taking a 20-question multiple choice test on which 5 points are awarded for each right answer, and 2 points for each question left blank, with nothing earned for an incorrect response.
David is taking a 20-question multiple choice test on which 5 points are awarded for each right answer, and 2 points for each question left blank, with nothing earned for an incorrect response. David wants to score at least 75, and is worried that he may have left too many questions unanswered. For ten points, what is the maximum number of questions David could leave blank and still have a chance at a 75? You have fifteen seconds.
David is taking a 20-question multiple choice test on which 5 points are awarded for each right answer, and 2 points for each question left blank, with nothing earned for an incorrect response.
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