A professor has recorded exam grades for 10 students in his class, but one of the grades is no longer readable. If the mean score on the exam was 81 and the mean of the 9 readable scores is 84, what is the value of the readable score?

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total number of students=10

grade that don't exist = x

then, mean of 10 students = 81, so total score = 81*10 = 810

mean of 9 students = 84, so total score of 9 students= 84*9 = 756

value of missing score = 810 - 756 = 54

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