1，In a retail store,the average(arithmetic mean)sale for month M was d dollars.Was the average(arithmetic mean) sale for monthe J at least 20% higher than that for month M?
(1)For month M, total revenue from sales was $3500.
(2)For month J,total revenue from sales was $6000.
选E, 解析说题目中没有说明销售总收入与平均销售之间的换算关系，这两之间除了每月30天平均，还有啥换算关系啊？
2，Town T has 20,000 residents, 60% of whom are female. what percent of the residents were born in Town T?
(1) The number of female residents who were born in Town T is twice the number of male residents who were not born in Town T.
(2)The number of female residents who were not born in Town T is twice the number of male residents who were born in Town T.
选C, 不理解。
求解析。谢谢！！作者: CrapSociety 时间: 2012-12-6 06:45
1、比如平均每个柜台的销量？
2、列方程
fb:female born; fn:female not born; mb:male born; mn:male not born;
