Question 644499
The day of a quiz, only Michelle was absent. The average grade of the other students was 85. When Michelle took a make-up quiz her grade was a 30 which lowered the class average to 80. How many students are in the class?
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n = # of others
(n*85 + 30)/(n+1) = 80
85n + 30 = 80n + 80
5n = 50
n = 10 others, + Michelle = 11 students