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A student’s average score for 10 tests was x. The grader then discovered that there was an error on two of the tests. On one of the tests, the student’s score should have been 10 points lower. On another test, the student’s score should have been 20 points higher. After the grader corrects these mistakes, what is the student’s new average, in terms of x?

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A student’s average score for 10 tests was <em>x</em>. The grader then discovered that there was an error on two of the tests. On one of the tests, the student’s score should have been 10 points lower. On another test, the student’s score should have been 20 points higher. After the grader corrects these mistakes, what is the student’s new average, in terms of <em>x</em>?






 
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