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Finding of a survey of Systems magazine subscribers: Thirty

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Re: Finding of a suvey of Systems magazine subscribers: Thirty [#permalink]

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New post 08 Jun 2015, 18:13
tarek99 wrote:
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 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 a mount 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 reponse to advertisements in Systems were not subscribers to the magazine.





//Lets consider 1000 subscribers and 500 non-subscribers = total 1500 purchasers.

1)
out of 1000 subscribers -->
30% are under 35 = 300 people are under 35
70% are over 35 = 700 people are under 35

2)
Now since it says out of all orders, most are under 35,
lets consider 790 orders are from people under 35
and 710 are from people over 35



Clearly both satisfy the given condition...


Now ...

out of 1000 subscribers 300 are under 35 and 700 are over 35
out of 500 non-subscribers 490 are under 35 and 10 are over 35




You can clearly see that 500 is not greater than 1000!

How can choice E be must be true? It cannot be a "must be true"
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Re: gmatprep CR - tricky one! [#permalink]

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New post 25 Aug 2015, 06:13
That is too tough a question to come at number 3 !!
More than the toughness it was time consuming.
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Re: Finding of a suvey of Systems magazine subscribers: Thirty [#permalink]

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New post 20 Dec 2015, 21:38
jatinrai wrote:
tarek99 wrote:
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.

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 a mount 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 reponse to advertisements in Systems were not subscribers to the magazine.


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!

Answer is E.

Orders placed = subscriber + non subscriber
If say 100 subscribers placed order & 30 of them were below thirty five.
If nonsub, who placed order, were 1000 & out of them 900 were below thirty five.
Now the total orders placed = 1100 & out of them 930 are from people below thirty five.

This makes both the statement stand true.



Orders placed = subscriber + non subscriber
If say 60 subscribers placed order & 18 of them were below thirty five.
If nonsub, who placed order, were 40 & out of them 33 were below thirty five.
Now the total orders placed = 100 & out of them 51 are from people below thirty five.

This makes both the statement stand true whereas Option E does not hold true. Correct me if I am wrong.

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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 20 Dec 2015, 21:40
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gummybear wrote:
miaojunmaggie wrote:
Can anyone explain it? I kind of get lost when reading the question. Complex...
why E is right? I chose C instead.


Let's assume
1. A total of 100 merchandise orders were placed last year by the subscribers in response to the advertisement.
2. A total of 200 merchandise orders were received by Systems in response to the advertisement (place by non-subscribers, or in the survey's terminology - people)

Therefore, total non-subscriber (people) orders = 100

It follows from #1 that
Subscribers under 35 years old = 30 orders
Subscribers equal-to/more than 35 years old = 70 orders

Since, From stimulus: Most of the merchandise orders
placed in response to advertisements in Systems last year were placed by people under age thirty-five
,

Subscribers + Non-subscribers (people) less than 35 years old = 101 and above

Hence, the OA is "E"



Orders placed = subscriber + non subscriber
If say 60 subscribers placed order & 18 of them were below thirty five.
If non-subscribers, who placed order, were 40 & out of them 33 were below thirty five.
Now the total orders placed = 100 & out of them 51 are from people below thirty five.

This makes both the statement stand true whereas Option E does not stand true. Correct me if I am wrong.

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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 26 Dec 2015, 01:53
How much time did you guys take to solve this question? I took arnd 4 mins. How can someone be so quick with such a weird question?

Honestly I found this argument really confusing.


I used POE to reach to the ans. I know that the correct answer is E , but how do you get to the answer in about 2-2.5 mins?

Arrghhh!! GMAT is not easy!!!
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Re: Finding of a suvey of Systems magazine subscribers: Thirty [#permalink]

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New post 28 Dec 2015, 08:23
Since both findings are about subscribers aged under 35 last year, the link between them is likely to fall under these two scopes as well
A. Concern people aged over 35 --> Out
B. Concern subscriber this year --> Out
C. Concern people aged over 35 --> Out
D. average dollar amount --> Out
E. Correct by POE & makes sense
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Re: Finding of a suvey of Systems magazine subscribers: Thirty [#permalink]

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New post 15 Jan 2016, 00:27
(E) CORRECT. This option clearly explains why although only 30% of the “Subscribers” who placed orders last were less than 35 years of age, of the total number of people who placed an order most of them were under 35 years of age i.e., these people were NOT SUBSCRIBERS. "Most" means more than 50%.

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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 16 Feb 2016, 12:03
I think E reflect the larger population of the advertisers survey which includes subscribers and non-subscribers , resolving the paradox.
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 28 Jul 2016, 07:19
I recently bumped into this question from elsewhere..
Option E - 'Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine'
Option E says 'who placed orders in response to adv in systems'

Isn't this statement requiring one more assumption that people who are non subscribers read 'systems' in the first place..? If somebody can clarify please..
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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miaojunmaggie wrote:
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.


Let's say that we have 100 people participating in the survey.

There are Subscribers and Non subscribers, and then there are people >35 or <35

Subscribers say that 30 were subscribers and <35
Advertisers say that most of the orders (more than 50) were placed by people <35

The above two statements mean that at least 21 (51-30) people were non-subscribers who placed the orders.
And, we do not get any information on people equal to or more than the age 35 other than <49 people ordered from this group.

(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. We have no information on split of group equal to or>35.

(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now. We have no information an the data of people then and now.

(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five. No. this is exact opposite to the information we have.

(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. We don't know the dollar value.

(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine. Correct choice.
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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It was very difficult to operate these statements in my head. So I used a diagram for overlapping sets.

I used 100 people who placed order as total (convenient for % problems)
I plugged in 99 people as people under age 35 who ordered merchandise (includes both subscribers and non-subscribers). Why 99? 99 can absolutely refer to most of people who placed order.

When I looked over the answers, I checked with my table:
(A) In my table there are only people who placed order. We don't know anything about subscribers who did not place order. Irrelevant
(B) We only regard the information from last year. What is happening "now" doesn't matter. Irrelevant
(C) Only 30% of subscribers under age 35 placed order last year. But the statement states "most". 30% is way to low for being "most". So untrue
(D) Wait a minute. The statement talks about dollar amount. We are only given information about number of people. Irrelevant
(E) In the table we see that at least 69 comprises the number of people who placed order. 69 absolutely qualifies to refer to "many" non-subscribers. True

It is a very time consuming question. If I get this question on the Test I probably would random guess.

Consider giving some kudos. I have only 0 kudos from the users. Appreciate it.
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 18 Oct 2016, 03:43
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. - We have no data about people who have never ordered merchandise
(B) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now. - We have data only about last year, we can not say anything about now
(C) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five. - We know that 30% of merchandise order were placed by those who are System subscribers AND below 35 years. So, 70% of merchandise order were by the people who are NOT system subscribers or NOT below 35 years
(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. - We do not know about the price of the merchandise, we only know about the quantity
(E) Last year many people who placed orders for merchandise in response to advertisements in Systems were not subscribers to the magazine. - Let us consider the merchandise that was ordered by people under 35 years age. These merchandise amount to more than 50% of all merchandise orders as per second finding. Whereas, only 30% of all merchandise orders were ordered by those who are system subscribers and under 35 years age. Hence at least 20% of all merchandise orders were from people who were under 35 years age and not system subscribers.
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 11 Dec 2016, 11:55
Here is my contribution.

It is an overlapping set problem.

Posted from my mobile device
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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The first finding says its includes subscribers placing orders. The 2nd finding talks about orders coming in response to the ads. There is also a gap in the numbers these findings are talking about. This gap is accounted for by the non subscribers, who picked the magazine and responded to ads. You can go ahead and pick E.
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Re: Thirty percent of all merchandise orders placed by subscribers [#permalink]

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New post 17 Jan 2017, 13:07
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 thirtyfive.

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.
The answer choice discuss about the subscribers who have never ordered merchandise and ather should be talking about the suscribers who have ordered.
b) Among subscribers to Systems, the proportion who are under age thirty-five was considerably lower last year than it is now.
Out of Scope
c) Most merchandise orders placed in response to advertisements in Systems last year were placed by Systems subscribers over age thirty-five.
The answer choice only focus on one of the finding of the serveys not both
d) Last year, the average dollar amount of merchandise orders placed was less for subscribers under age thirtyfive than for those age thirty-five or over.
Out of Scope
e) Last year many people who placed orders for merchandise in response to advertisements in Systems were not
subscribers to the magazine
Correct Answer Choice
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 07 Apr 2017, 02:36
(A) Out of scope. We don't care about subriscribers who didn't place any order. Also it brings new information to the argument that is incorrect by default in relation to Inference/Must be true types.
(B) Out of scope. Irrelevant comparison as nothing is brought up in the argument regarding current situation. And again it brings new information which is incorrect.
(C) Incorrect. It attacks 2nd premise in the argument, since by GMAT theory, premises (facts) can't be attacked by answer options.
(D) Out of scope. We don't care about dollar-amount. And again new information is inserted.
(E) Correct. Although nothing is mentioned regarding the concrete amounts this statement must be true.

So, by properly applying GMAT constraints we can come to a correct choise using POE.
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 03 Jun 2017, 06:47
Marcab wrote:
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 thirtyfive
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.

Found it to be a good one, initially.
OA
[Reveal] Spoiler:
soon


It E .
- 30% by systems magazine subs.(below 35)
-most by below 35age(most means 50%+)

So at least some percentage was ordered by non subscribers.
E states that
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 15 Jun 2017, 07:40
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 thirtyfive
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.

Can someone explain the solution?
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Re: Finding of a survey of Systems magazine subscribers: Thirty [#permalink]

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New post 16 Jun 2017, 16:32
the question again is a mix question combining both explanation and inference, if ones read 2 original claims carefully, ones will easily find out that the only thing that makes the difference is the subscriber and 35-year people.
E is probably the answer, but because if "many", E can be a trap. At this point, you can scan other answer and use POE or go ahead with E.
Re: Finding of a survey of Systems magazine subscribers: Thirty   [#permalink] 16 Jun 2017, 16:32

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