745  Average
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Class A - 12 students with the score 70%.
Class B - 8 students with the score 80%.
What is the total average score?



Class A - 16 students with the score 70%.
Class B - 4 students with the score 50%.
What is the total average score?



Class A - 12 students with the score 80%.
Class B - 8 students with the score 90%.
What is the total average score?



Class A - 6 students with the score 70%.
Class B - 4 students with the score 60%.
What is the total average score?



Class A - 16 students with the score 80%.
Class B - 4 students with the score 50%.
What is the total average score?



Class A - 17 students with the score 60%.
Class B - 3 students with the score 70%.
What is the total average score?



Class A - 13 students with the score 80%.
Class B - 7 students with the score 50%.
What is the total average score?



Class A - 7 students with the score 60%.
Class B - 3 students with the score 80%.
What is the total average score?



Class A - 7 students with the score 70%.
Class B - 3 students with the score 70%.
What is the total average score?



Class A - 12 students with the score 50%.
Class B - 8 students with the score 60%.
What is the total average score?



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745    74 66 84 66 74 ( 364 )   61.5 69.5 66 70 54 ( 321 )   [[ 685 ]]