565  Average
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Class A - 3 students with the score 70%.
Class B - 7 students with the score 40%.
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 - 2 students with the score 60%.
Class B - 8 students with the score 80%.
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 - 18 students with the score 80%.
Class B - 2 students with the score 60%.
What is the total average score?



Class A - 6 students with the score 40%.
Class B - 4 students with the score 60%.
What is the total average score?



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



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



Class A - 5 students with the score 90%.
Class B - 5 students with the score 60%.
What is the total average score?



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565    49 66 76 66 78 ( 335 )   48 59 73 74 75 ( 329 )   [[ 664 ]]