The math test

The math test contains 20 problems. For each correctly solved problem, the solver gets 3 points. For each incorrectly solved or unsolved problem, 2 points are deducted. Ondrej got 25 points. How many problems did he solve correctly?

Correct answer:

n =  13

Step-by-step explanation:

25 = 3n - 2(20-n)

25 = 3·n - 2·(20-n)

5n = 65

n = 65/5 = 13

n = 13

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