GMAT/留學申請專業顧問 Donz 之資訊交流園地

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.

題目簡介: 在去年，從 magazine 訂閱商品的人當中， 30% 小於 35 歲。從 systems 訂閱商品的人當中，大多數 (假定 > 80%) 小於 35 歲。

正確答案 (E): 從 system 訂閱商品的人當中，大多不是 magazine 訂閱的人。  
很明顯題目的 "system 訂閱者" 和 "magazine 訂閱者"，在年齡分佈上有絕對的差異。所以這兩個族群，必定不可能有絕大的 overlap。而答案 (E) 則指出這樣的現象。

錯誤答案 (A): "System 訂閱者當中沒有訂購商品者，有更多人超過 35 歲" 
"More subscribers to Systems "who have never ordered" merchandise"  -->  沒有訂閱商品的族群並非題目討論的族群，可不必浪費時間直接刪掉。

錯誤答案 (B): "System 訂閱者當中，35 歲以下的比例，今年比去年少" 
" the proportion who are under age thirty-five was considerably lower last year than "it is now"."  -->  題目並沒有討論今年的狀況，可不必浪費時間直接刪掉。

錯誤答案 (C): "從 System 廣告訂閱之商品，大部分是由超過 35 歲以上的訂購者訂閱" 
-->  明顯與事實有所出入，錯誤。

錯誤答案 (D): "從訂購者訂購的商品，35 歲以下的訂購金額少於 35 以上的訂購金額。" 
-->  Last year, the average "dollar amount" of merchandise。  -->  完全沒提到，直接刪掉。