(25359-!-item-!-188;#058&001894)请教解题思路

(25359-!-item-!-188;#058&001894)

Finding of a survey of Systems magazine subscribers:  Thirty percent of all merchandise orders placed by subscribers in response to advertisements in the magazine last year were placed by subscribers under age thirty-five.

Finding of a survey of advertisers in Systems magazine:  Most of the merchandise orders placed in response to advertisements in Systems last year were placed by people under age thirty-five.

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

(A) More subscribers to Systems who have never ordered merchandise in response to advertisements in the magazine are age thirty-five or over than are under age thirty-five.

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

(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.

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

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

晕，写了一堆居然弄没了；大概说下：

lz要注意两组概念：

1。subscribers；30%；

2。people；most;

显然most>30%,那么就说明有很多人并不在subscribers之内的也购买了；打个比方，有10个subscriber,3个在35岁以下；那么如果总共有100个人买了，而且这当中有很多人也<35，那么总的<35的比例肯定要高于30%

是不是可以这样理解,SUBSCRIBER+NONSUBCRIBER=PEOPLE(WHOLE PURCHASE ORDER)

第一个SURVEY: 35% OF SUBSCRIBER 小于30岁

第二个SURVEY: 大于50%的PEOPLE即 50%(SUBSCRIBER +NONSUBSCRIBER) 小于30岁

IF SUBSCIRBER IS 10, THEN 3 SUBSCRIBER 小于30岁, AND IF TOTAL SUBSCRIBERS AND NONSBUBSCRIBERS IS 100, 小于30岁的MORE THAN 50, AMONG 90 NONSUBSCRIBER , MORE THAN 47 小于30岁.

我的疑惑是,为什么答案中没有提及小于30岁的人呢. 我的思路是,如果答案中说 在NONSUBSCRIBERS 中有更高比例的人小于30岁,更让人看着答案

这题是不是有点象数学中的权重平均数的题呢,请NN指定啊

这道题目简直是在念经！每个字都认识，但读完就觉得在讲绕口令。

1，S杂志 订阅者调查 发现：在S杂志订阅者看了广告后产生的购物订单中，30％的订单来自于35岁以下订阅者。也就是:S订阅者中买东西的人，30% < 35

2，S杂志 广告商调查 发现：看了S杂志广告后产生的购物订单中，大多数的购买者是小于35岁的。

A.更多看了广告没买东西的订阅者小于等于35岁。（文章中没有关于：看了广告没买东西的订阅者的信息，属于范围不对）

B.去年和今年比，无关。

C.在看了S杂志广告后产生的购物订单中，大多数的订单来自于超过35岁订阅者。(这个和2相反!)

D.order前莫名奇妙加了个修饰，无关。

E.看饼图,结论就是很多买东西的人是蹭杂志看的。正确。

饼图如下：(下载放大看）

 [attachimg]65348[/attachimg]