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At a certain conference, 72% of the attendees registered at

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Manager
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At a certain conference, 72% of the attendees registered at [#permalink] New post 24 Apr 2014, 21:07
Why is this question locked?

http://gmatclub.com/forum/at-a-certain-conference-72-of-the-attendees-registered-at-139035.html#p1257947

I agree with many others in the questions thread that it has not been dealt with correctly. IMO the question stem is incorrect.

See attached document - everyone is giving the answer for finding the % of attendees who paid the conference fee in full - which is 80%. When the question actually, incorrectly asks for percentage of conference attendees registered at least 2 weeks in advance.

See the attached document, I have input y and x. The question asks for y, but the 'correct' answer is being shown as x. With the information given there is no way to answer for y.

Question comes from the Jeff Sackmann sets.
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Re: At a certain conference, 72% of the attendees registered at [#permalink] New post 24 Apr 2014, 23:22
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actionj wrote:
Why is this question locked?

http://gmatclub.com/forum/at-a-certain-conference-72-of-the-attendees-registered-at-139035.html#p1257947

I agree with many others in the questions thread that it has not been dealt with correctly. IMO the question stem is incorrect.

See attached document - everyone is giving the answer for finding the % of attendees who paid the conference fee in full - which is 80%. When the question actually, incorrectly asks for percentage of conference attendees registered at least 2 weeks in advance.

See the attached document, I have input y and x. The question asks for y, but the 'correct' answer is being shown as x. With the information given there is no way to answer for y.

Question comes from the Jeff Sackmann sets.



Its showing up as "Poor Quality"; may be locked due to it.....
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Re: At a certain conference, 72% of the attendees registered at [#permalink] New post 25 Apr 2014, 00:23
Thanks, how can you tell it was locked due to poor quality? I could not see that anywhere.

I was looking for vindication that I am not going crazy. You know how it is with all this GMAT study - sometimes you get a bit of cabin fever.
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Re: At a certain conference, 72% of the attendees registered at [#permalink] New post 25 Apr 2014, 01:03
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actionj wrote:
Thanks, how can you tell it was locked due to poor quality? I could not see that anywhere.

I was looking for vindication that I am not going crazy. You know how it is with all this GMAT study - sometimes you get a bit of cabin fever.



Please see the screenshot below:
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Re: At a certain conference, 72% of the attendees registered at [#permalink] New post 08 May 2014, 09:48
@actionj

I agree with others that the question stem needs to be modified to "what percent of the conference attendees paid their conference fee in full?" to make this question correct.

This is one problem with practicing with unofficial GMAT questions. They often contain ambiguous statements. Here is an official GMAT question that relies on the same thought process. It is a hard question but the language is precise.

On a certain road 10% of the motorists exceed the posted speed limit and receive speeding tickets, but 20% of the motorists who exceed the posted speed limit do not receive speeding tickets. What percent of the motorists on the road exceed the posted speed limit?

A. 10.5%
B. 12.5%
C. 15%
D. 22%
E. 30%

Cheers,
Dabral
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Re: At a certain conference, 72% of the attendees registered at [#permalink] New post 20 May 2014, 23:48
The solution to the above question is B: 12.5%

This question seems hard at the first glance, but making a Venn Diagram makes it easy to understand.

Attachment:
Speeding Ticket.PNG
Speeding Ticket.PNG [ 8.25 KiB | Viewed 280 times ]


Notation:

M represents the set of all motorists
S represents the set of motorists who exceeded speed
T represents the set of motorists who exceeded speed and got a ticket

The question says that 20% of all motorists who exceeded speed did not get a ticket.

Have a look at the Venn Diagram. Which area represents such motorists?

The orange one.

So, if orange area is 20% of the set S, then what % of S will be the red area?

80%.

It's also given that 10% of all motorists exceed speed and get a ticket. Which area of the diagram represents these motorists?

Again, the red area.

So, we get the equation:

10% of M = 80% of S
So, S = 1/8 of M = 12.5% of M.

Hence, Option B.
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Re: At a certain conference, 72% of the attendees registered at [#permalink] New post 21 May 2014, 00:20
Another way to solve it:
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Re: At a certain conference, 72% of the attendees registered at   [#permalink] 21 May 2014, 00:20
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