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On a certain road 10% of the motorists exceed the posted spe

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Senior Manager
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Re: On a certain road 10% of the motorists exceed the posted spe [#permalink] New post 17 Jul 2013, 07:24
I agree that the level of a question depends on real gmat test takers' results. But imho this tag on a forum shouldnt be assessed by the level of only current gmatclub users, since perhaps current guys can be math genious or vise versa dummies like me:)

So , i wanted Bunuel to assess the level of a question, using his experience. He solved lots of gmat questions and knows well all ins&outs of this test. I feel better when i see his assessment rather than the one generated by some unknown to me users.

Anyways, i dont insist on anything. It is ur forum and ur rules. I just expressed my thoughts as a user and hope didnt offend anyone.

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Last edited by LalaB on 17 Jul 2013, 07:31, edited 1 time in total.
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Re: On a certain road 10% of the motorists exceed the posted spe [#permalink] New post 17 Jul 2013, 07:28
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Re: On a certain road 10% of the motorists exceed the posted spe [#permalink] New post 17 Jul 2013, 19:49
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LalaB wrote:
I agree that the level of a question depends on real gmat test takers' results. But imho this tag on a forum shouldnt be assessed by the level of only current gmatclub users, since perhaps current guys can be math genious or vise versa dummies like me:)

So , i wanted Bunuel to assess the level of a question, using his experience. He solved lots of gmat questions and knows well all ins&outs of this test. I feel better when i see his assessment rather than the one generated by some unknown to me users.

Anyways, i dont insist on anything. It is ur forum and ur rules. I just expressed my thoughts as a user and hope didnt offend anyone.

Posted from my mobile device Image



Dear LalaB,

As Bunuel said, the question of offend does not arise. When someone asks me the level of a question, I usually look at the question and judge according to my experience and move on. I do not go into details of why it is an inaccurate exercise. In this case I got into an explanation because you are a seasoned and valued participant of this community - with people like that, your mind instinctively tries to go out of its way to help, discuss and give what you think is the best answer (I might have offended someone else now!) I actually did not go to the question to judge what level it is before putting my response because that was irrelevant to the point I was trying to make.
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On a certain road 10 percent of the motorists exceed the pos [#permalink] New post 10 Sep 2013, 00:55
On a certain road 10 percent of the motorists exceed the posted speed limit and receive speeding tickets, but 20 percent 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 1/2%
(B) 12 1/2%
(C) 15%
(D) 22%
(E) 30%

It is an old OG problem that has not been explained clearly before. Please provide a detailed solution to the problem.

On another note, I notice that the overlapping sets are very often tested in this fairly confusing way, where I personally feel I am unable to use the grid advocated by MGMAT or Venn Diagram for that matter. I'm wasting plenty of time on setting it up. Any other methods you guys suggest to solve these? Or should I just "think better":)

Since this is the last problem of the set I presume it to be a 700+ level question, but it seems to me that in general GMAT is much harder these days that it was 10 years ago, so I'd guess it is hardly a 650 level today. Share your thoughts.
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Re: On a certain road 10 percent of the motorists exceed the pos [#permalink] New post 10 Sep 2013, 01:03
I think I got it with the grid...:)
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Re: On a certain road 10 percent of the motorists exceed the pos [#permalink] New post 10 Sep 2013, 02:00
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obs23 wrote:
On a certain road 10 percent of the motorists exceed the posted speed limit and receive speeding tickets, but 20 percent 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 1/2%
(B) 12 1/2%
(C) 15%
(D) 22%
(E) 30%

It is an old OG problem that has not been explained clearly before. Please provide a detailed solution to the problem.

On another note, I notice that the overlapping sets are very often tested in this fairly confusing way, where I personally feel I am unable to use the grid advocated by MGMAT or Venn Diagram for that matter. I'm wasting plenty of time on setting it up. Any other methods you guys suggest to solve these? Or should I just "think better":)

Since this is the last problem of the set I presume it to be a 700+ level question, but it seems to me that in general GMAT is much harder these days that it was 10 years ago, so I'd guess it is hardly a 650 level today. Share your thoughts.


Merging similar topics. Please refer to the different approaches offered on page 1 and ask if anything remain unclear.
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Re: On a certain road 10 percent of the motorists exceed the pos   [#permalink] 10 Sep 2013, 02:00
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