The experimental primary school held a math competition.

Because I got 7 points for answering a question correctly.

Solution: If she answers X questions incorrectly, she answers (10-X) questions correctly.

Because you get 7 points for answering a question correctly, * * * (10-x) gets 7 points, and because you get 3 points for answering a question incorrectly, you get 3X points, so the equation is

7( 10-X)-3X=50

70- 10X=50

X=2

She typed two wrong questions.

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