375  Average
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Class A - 2 students with the score 40%.
Class B - 8 students with the score 50%.
What is the total average score?



Class A - 5 students with the score 70%.
Class B - 5 students with the score 60%.
What is the total average score?



Class A - 8 students with the score 80%.
Class B - 2 students with the score 40%.
What is the total average score?



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



Class A - 8 students with the score 70%.
Class B - 2 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 70%.
What is the total average score?



Class A - 2 students with the score 80%.
Class B - 8 students with the score 50%.
What is the total average score?



Class A - 16 students with the score 70%.
Class B - 4 students with the score 80%.
What is the total average score?



Class A - 8 students with the score 70%.
Class B - 2 students with the score 40%.
What is the total average score?



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



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375    48 65 72 70 72 ( 327 )   70 56 72 64 62 ( 324 )   [[ 651 ]]