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A demographic study describes a group of corporation executives and non executives having an average (arithmetic mean) age of 42 years. If the executives in the group average 40 years of age and the nonexecutives average 45 years of age, what is the ratio of the number of executives to the number of non executives in the group?
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2.1.4 比例及相关应用题
2.1.4 比例及相关应用题
以上解析由 考满分老师提供。
