Question

1. On the last 5 quizzes, Marco has earned a total of 21 out of 25 possible points. If he has a perfect

Answer 1

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;

$\frac{21 + 5x}{5(5 + x)} \times 100\% = \frac{90}{100}$

• 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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