这个prep的must be true 题实在看不懂啊。。。跪求解释

cloudylee

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.

答案：E
他这个题到底想说的是什么啊？！！

wyw1018

下订单中有subscribers 和nonsubscribers，根据题意35岁以下的占subscribers下单总量30%，而35以下下单总量占总下单量超过50%，因此必定有很大一部分订单来自nonsubscribers才能成立。

ainiAnnie

http://forum.chasedream.com/GMAT_CR/thread-660528-1-9.html