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题目内容
Of the 250 students enrolled in a college economics course, 50 percent have never taken an economics course before. If 20 percent of the students in the class are sophomores and 80 percent of the sophomores in the class have never taken an economics course before, how many of the students in the class who have taken an economics course before are not sophomores?
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6.1.3 双重叠应用题
6.1.3 双重叠应用题
以上解析由 考满分老师提供。