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[Problem Solving]
试题详情
题目：
A teacher gave the same test to three history classes: A , B , and C . The average (arithmetic mean) scores for the three classes were 65, 80, and 77, respectively. The ratio of the numbers of students in each class who took the test was 4 to 6 to 5, respectively. What was the average score for the three classes combined?
选项:
A、74
B、75
C、76
D、77
E、78
答案:
B
提问：
数学
解答：
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提问：
ps
解答：
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提问：
数学
解答：
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