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Part of 1997 Portugal MO

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20 questions, 7-2-0 points, 87 total - Portugal OPM 1997 p1

Source:

5/18/2024
A test has twenty questions. Seven points are awarded for each correct answer, two points are deducted for each incorrect answer and no points are awarded or deducted for each unanswered question. Joana obtained 8787 points. How many questions did she not answer?
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