300  Average
1

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Class A - 3 students with the score 50%.
Class B - 7 students with the score 90%.
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 - 3 students with the score 70%.
Class B - 7 students with the score 90%.
What is the total average score?



Class A - 16 students with the score 80%.
Class B - 4 students with the score 60%.
What is the total average score?



Class A - 12 students with the score 70%.
Class B - 8 students with the score 60%.
What is the total average score?



Class A - 7 students with the score 60%.
Class B - 3 students with the score 70%.
What is the total average score?



Class A - 3 students with the score 90%.
Class B - 7 students with the score 50%.
What is the total average score?



Class A - 17 students with the score 80%.
Class B - 3 students with the score 70%.
What is the total average score?



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



Class A - 15 students with the score 60%.
Class B - 5 students with the score 60%.
What is the total average score?



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300    78 74 84 76 66 ( 378 )   63 62 78.5 74 60 ( 337.5 )   [[ 715.5 ]]