There are ten questions in the math contest, and it is stipulated that one correct answer is ten points and the other wrong answer is three points. Sean got a total of 6 1 point. He answered several questions correctly. If you answer question X correctly, there are:

10x-3( 10-x)= 6 1；

13x-30 = 6 1；

13x = 9 1；

x = 7；

So I got seven questions right.

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