833  Average
2

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Class A - 15 students with the score 50%.
Class B - 5 students with the score 40%.
What is the total average score?



Class A - 18 students with the score 80%.
Class B - 2 students with the score 40%.
What is the total average score?



Class A - 14 students with the score 90%.
Class B - 6 students with the score 80%.
What is the total average score?



Class A - 8 students with the score 80%.
Class B - 2 students with the score 50%.
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 - 8 students with the score 60%.
Class B - 2 students with the score 90%.
What is the total average score?



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



12 紐���� ��⑦�����諛���� ���洹���������� 50 �����닿��,
8 紐���� ��ы�����諛���� ���洹���������� 40 �����쇰��,
��� 諛� ���泥� ���洹� ��������� ��쇰����멸��?



Class A - 14 students with the score 80%.
Class B - 6 students with the score 70%.
What is the total average score?



Class A - 17 students with the score 60%.
Class B - 3 students with the score 50%.
What is the total average score?

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