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题库 / Prep2012-CR-65
The percentage of households with an annual income of more than $40,000 is higher in Merton County than in any other county. However, the percentage of households with an annual income of $60,000 or more is higher in Sommer County.
If the statements above are true, which of the following must also be true?
The percentage of households with an annual income of $80,000 is higher in Sommer County than in Merton County.
Merton County has the second-highest percentage of households with an annual income of $60,000 or more.
The percentage of households with an annual income between $40,000 and $60,000 is higher in Merton County than in Sommer County.
The total number of households with an annual income of more than $40,000 is greater in Merton County than in Sommer County.
Average annual household income is higher in Sommer County than in Merton County.
M城年收入超$40,000 的家庭比例比其他城市都高。然而，S城年收入超$60,000 的家庭比例更高；演绎推理
A. 年收入超$80,000 的家庭比例S比M高； M和S都有超过8000的收入家庭，题干条件不足不能比较，排除
B. M城年收入超$60,000 的家庭比例第二高；无根据推理，排除
C. M在年收入$40,000-$60,000的家庭比例比S高；S低于60000的家庭比例小于M，正确
D. 原文是比例，选项是数量，无关；
E. 平均年收入比较；不知道家庭数量，没有分母，无法比较平均，排除
household 家庭的日常收入
因为设 M 市 40000-60000 为Ａ1,60000 以上为Ｂ１，总人口为Ｃ１，S 市相应 A2, B2
和Ｃ２，则有（A1+B1)/C1>(A2+B2)/C2, B1/C1A2/c2，同时 A1/B1
不能为０，否则第一个不等式就不成立了