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The number of points Marco needs to bring his average up to 90% is 15points.
If there's a possible 25 possible points, and Marco has taken 5 quizzes;
Evidently, each quiz has weighs 5 points.
Mathematically;
- 2100 + 500x = 2250 + 450x
- 50x = 150
x = 3.
Therefore, he needs 5x points = 15 points to bring his average up to 90%.
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