612  Average
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Class A - 6 students with the score 70%.
Class B - 4 students with the score 50%.
What is the total average score?



Class A - 3 students with the score 80%.
Class B - 7 students with the score 70%.
What is the total average score?



Class A - 6 students with the score 90%.
Class B - 4 students with the score 50%.
What is the total average score?



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



Class A - 6 students with the score 50%.
Class B - 4 students with the score 50%.
What is the total average score?



Class A - 3 students with the score 80%.
Class B - 7 students with the score 90%.
What is the total average score?



Class A - 17 students with the score 90%.
Class B - 3 students with the score 70%.
What is the total average score?



Class A - 15 students with the score 40%.
Class B - 5 students with the score 70%.
What is the total average score?



Class A - 7 students with the score 50%.
Class B - 3 students with the score 70%.
What is the total average score?



Class A - 8 students with the score 60%.
Class B - 2 students with the score 90%.
What is the total average score?



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612    62 73 74 80 50 ( 339 )   87 87 47.5 56 66 ( 343.5 )   [[ 682.5 ]]