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标题: 这是道不错的题，已有答案，希望大家能看下！！！！！！ [打印本页]

作者: gutter1900 时间: 2011-12-10 12:37
标题: 这是道不错的题，已有答案，希望大家能看下！！！！！！
12. (25359-!-item-!-188;#058&001894)

Finding of a survey of Systems magazinesubscribers: Thirty percent of allmerchandise orders placed by subscribers in response to advertisements in themagazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systemsmagazine: Most of the merchandise ordersplaced in response to advertisements in Systems last year were placed by peopleunder age thirty-five.

For both of the findings to be accurate, which ofthe following must be true?

(A) More subscribers to Systems who have neverordered merchandise in response to advertisements in the magazine are agethirty-five or over than are under age thirty-five.

(B) Among subscribers to Systems, the proportionwho are under age thirty-five was considerably lower last year than it is now.

(C) Most merchandise orders placed in response toadvertisements in Systems last year were placed by Systems subscribers over agethirty-five.

(D) Last year, the average dollar amount ofmerchandise orders placed was less for subscribers under age thirty-five thanfor those age thirty-five or over.

(E) Last year many people who placed orders formerchandise in response to advertisements in Systems were not subscribers tothe magazine.

作者: gutter1900 时间: 2011-12-10 23:04
为什么没有人帮忙啊。。。

作者: 小蠢爷郭郭 时间: 2011-12-12 13:55
这道题我也纠结了很久。
然后我自己想大概是
题干说
1.一个关于S杂志订阅的调查显示，35%的订阅者来自年龄低于35岁
2.一个关于关S杂志的广告商的调查显示，大部分下订单的人年龄低于35岁。

要使这两个事实都成立，就要解决这两个事实间的矛盾处，只有E选项能解决这两者间的矛盾。那就是说在广告商那里下订单的人（大部分是年龄低于35岁）并没有全部订阅这本杂志。这里应该就是说，在广告商那里下了订单并不代表最终订阅了这本杂志（subscriber & people who placed the orders）

不知道这样解释想得通不

作者: 12604698 时间: 2011-12-12 15:07
这道题读起来是很绕，搞定比较对象就明白只是个简单的数学题。
这种比例题注意of前后，也就是谁占谁的百分之几。
两个finding，都是研究订单是谁订的订单。
要清楚第一个finding介绍的分母是订阅者看到广告后下的订单，而第二个分母是看到广告的下的订单。
也就是第二个包含第一个。即下订单的一部分是订阅者，一部分不是。
再看分子：都是35以下多少人下订单。这个35以下订单也相应分为订阅者非订阅者。
订阅者订单中35以下只占百分之三十。第二个发现：而全部订阅者35以下占了大多数.
唯一的解释就是35以下非订阅者很多。才能将总体比例拉回来，所以就说明非订阅者有many。
类似于finding1： a/b=35% fingding2： a+c/b+d= most说明c和d存在，且很多。~

作者: gutter1900 时间: 2011-12-12 17:29
谢谢楼上两位大侠侠女。

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