What's the percent?
Algebra
Level
2
Twelve students in a class average 70% on a certain test. Eighteen others average 80%. What is the overall average of the thirty students as a percent?
74.75
76
75.25
77.125
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1 solution
Total for the 1 2 students = ( 1 2 ) ( 7 0 ) = 8 4 0
Total for the 1 8 students = ( 1 3 ) ( 8 0 ) = 1 4 4 0
Average of the 3 0 students = 3 0 8 4 0 + 1 4 4 0 = 7 6 %