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 result:

n =  13


25 = 3n - 2(20-n)

25 = 3•n - 2•(20-n)

5n = 65

n = 13

Our simple equation calculator calculates it.

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