281  Average
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Class A - 5 students with the score 60%.
Class B - 5 students with the score 40%.
What is the total average score?



Class A - 18 students with the score 40%.
Class B - 2 students with the score 40%.
What is the total average score?



Class A - 4 students with the score 40%.
Class B - 6 students with the score 40%.
What is the total average score?



Class A - 8 students with the score 90%.
Class B - 2 students with the score 50%.
What is the total average score?



Class A - 13 students with the score 40%.
Class B - 7 students with the score 50%.
What is the total average score?



Class A - 2 students with the score 90%.
Class B - 8 students with the score 80%.
What is the total average score?



Class A - 5 students with the score 40%.
Class B - 5 students with the score 40%.
What is the total average score?



Class A - 12 students with the score 90%.
Class B - 8 students with the score 70%.
What is the total average score?



Class A - 4 students with the score 90%.
Class B - 6 students with the score 80%.
What is the total average score?



Class A - 17 students with the score 80%.
Class B - 3 students with the score 60%.
What is the total average score?



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281    50 40 40 82 43.5 ( 255.5 )   82 40 82 84 77 ( 365 )   [[ 620.5 ]]