GMATPREP 破解版 CR 12

请教GMATPREP 破解版中的逻辑部分，第12题:

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.

The answer is E.

Although I choose C, the real meaning of the 2 findings above is kind of confused. To my understanding, only 1st finding quotes the percentage 30%. How could we take such accurate figure into vague description as "many people"?

Pls kindly help. Tks!

Thanks Simon！平时写东西快了，加上基础不好，写东西都是乱来的，毫无语法可言，就请凑或着看拉~~~

这个这个，上面的解释真的有点复杂，难道这道题只能用这个思路解决？因为我总觉得ETS和Yankee们是不可能有这么mathematic的思路的。。。

我再解释下看吧.

就是第一个finding里说的是,订杂志的、下定单的人里，有30%的人35岁以下。

第二个finding里说, 所有的（包括订杂志和不订杂志）、下定单的人里的大多数（假设60%吧），是35岁以下的。

假设总共有100人下了定单，那么根据finding 2，就有100X60%= 60人是35岁以下的

可能不可能所有下定单的人都订了杂志？不可能！因为如果这100个人都订了杂志的话，则根据finding 1,推出100X30% = 30人是35岁以下，30人跟60人不等了。所以下定单的人里肯定有人没订杂志。

想象这么一个图，外面一个大圈，代表所有下了定单的人，大圈里面套一个下圈，代表所有下定单的人中订了杂志的人。那么大圈内、小圈外的部分，就是下了定单而没有订杂志的人，就是E说的，很多下了定单的人没订杂志。

我只能解释到这地步了,很抱歉啊,自己再仔细想一想吧.偶就是觉得自己表达能力不好想锻炼锻炼才上来给逻辑部分解题的,呵呵!