Question

The average score on a recent test was 75%. One of the students earned a grade of 93% while another student earned a grade of 78%. A total of 23 students took the test. Find the average grade of the remaining 21 students.
If the average of the 21 students is x, then

21x + 78 + 93 = 23*75
Is that the answer or formula to go by

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