Finding of a suvey of Systems magazine subscribers: Thirty percent of all merchandise orders placed by subscribers in reponse 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 merchanise in response to advertisements in the magazine are age thirty-five was considerably lower last year than it is now. -> there is no mention of comparison between today and yesterday

b) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now. -> same as above ELIMINATE
c) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five. -> not suyre no where we know the proportion of orders by subscribers

d) Last year, the average dollar a mount of merchandise orders placed was less for subscribers under age thirty-five than for those age thirty-five or over. -> OOS

e) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine. -> APT here since if this is true the above argument is correct i.e. we can say 30 % of subscribers orders wher by <35 age grp and also at the same time most of all the orders are by <35


I got this question from the GMATprep. Please explain why your answer choise is correct and why the rest of the answer choices are wrong. Thanks!

wow, you guys are good. The OA is E. I honestly couldn't see it. What difficulty level would you guys rate this question? I really struggled with this question type and I would need to practice more. Where would you suggest that I find such questions to practice with?

regards,