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A quiz has twenty questions with seven points awarded for each correct answer, two points deducted for each wrong answer

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A quiz has twenty questions with seven points awarded for each correct answer, two points deducted for each wrong answer and zero for each question omitted. Jack scores 87 points. How many questions did he omit?
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The only way to get 87 is to get 13 questions correct and 2 wrong, leaving 5 questions unattempted.
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