11. A physics contest has 30 multiple-choice questions. A correct answer gains 4 points, while a wrong answer loses 1 point. Rolly answered every question and scored 55 points. How many questions did he answer correctly?
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Second, we know that for each correct answer, Rolly gains 1 point, and for each wrong answer, he loses 1 point. Third, we know that Rolly scored 55 points. If Rolly answered all questions correctly, he would have scored 30 points. But he scored 55 points, Show more…
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