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# M02-03

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Math Expert
Joined: 02 Sep 2009
Posts: 53066

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15 Sep 2014, 23:16
1
1
00:00

Difficulty:

15% (low)

Question Stats:

73% (00:35) correct 27% (00:43) wrong based on 158 sessions

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If a website registered 810 new members in June, how many of the new, registered members were from USA?

(1) In June, the ratio of new members from USA, Europe and Asia was 4:3:2 respectively.

(2) In June, none of the members were from locations other than USA, Europe and Asia.

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Joined: 02 Sep 2009
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15 Sep 2014, 23:17
Official Solution:

(1) In June, the ratio of new members from USA, Europe and Asia was 4:3:2 respectively. We don't know whether there were new members from some other parts of the world (Africa for example). Not sufficient.

(2) In June, none of the members were from locations other than USA, Europe and Asia. Not sufficient on its own.

(1)+(2) From (2) we know that all 810 new members were from USA, Europe and Asia and (1) gives their ratio 4:3:2. So, $$4x+3x+2x=810$$ giving $$x=90$$, hence $$\text{USA}=4x=4*90=360$$. Sufficient.

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Joined: 19 Aug 2014
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27 Jan 2015, 09:20
I think this question is poor and not helpful.
Math Expert
Joined: 02 Sep 2009
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27 Jan 2015, 09:24
Ivan90 wrote:
I think this question is poor and not helpful.

Would you mind to elaborate a bit? Thank you.
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Joined: 17 Mar 2015
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17 Mar 2015, 23:53
1
I would presume Ivan90 means that it is very easy to grasp the idea, the only moment which might be looking like a "trap" is the fact that it is not mentioned that people who registered were only from the USA, Europe or Asia. But its easily discovered when you read the second statement.

Basically the way an inexperienced person would approach the question would be like this.
step 1 - ok, #1 works fine, seems sufficient, easy equation: 4x + 3x + 2x = 810, nothing special
step 2 - then you read statement #2 and realise that "oh wait, there was indeed nothing about people only being from USA, Europe and Asia, gotta rethink #1 and realise that there is another variable that makes #1 insufficient (4x + 3x +2x + "others" = 810) and a combination of #1 and #2 (nullifying that variable "others") sufficient.

Thats why this question is rather poor, but I'd say it is somewhat helpful in a way that you notice thise little quirks aka "but nothing was mentioned about other countries"
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Joined: 17 Aug 2014
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11 Aug 2015, 19:49
Well said, Z. I had no inclination that other countries would have been considered until reading the second statement. I think this question should be scrapped.
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20 Aug 2015, 08:17
Zhenek wrote:
I would presume Ivan90 means that it is very easy to grasp the idea, the only moment which might be looking like a "trap" is the fact that it is not mentioned that people who registered were only from the USA, Europe or Asia. But its easily discovered when you read the second statement.

Basically the way an inexperienced person would approach the question would be like this.
step 1 - ok, #1 works fine, seems sufficient, easy equation: 4x + 3x + 2x = 810, nothing special
step 2 - then you read statement #2 and realise that "oh wait, there was indeed nothing about people only being from USA, Europe and Asia, gotta rethink #1 and realise that there is another variable that makes #1 insufficient (4x + 3x +2x + "others" = 810) and a combination of #1 and #2 (nullifying that variable "others") sufficient.

Thats why this question is rather poor, but I'd say it is somewhat helpful in a way that you notice thise little quirks aka "but nothing was mentioned about other countries"

Even without statement (2) we cannot assume that there are no people from other parts of the world.
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Joined: 21 May 2013
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20 Aug 2015, 11:00
Bunuel wrote:
Zhenek wrote:
I would presume Ivan90 means that it is very easy to grasp the idea, the only moment which might be looking like a "trap" is the fact that it is not mentioned that people who registered were only from the USA, Europe or Asia. But its easily discovered when you read the second statement.

Basically the way an inexperienced person would approach the question would be like this.
step 1 - ok, #1 works fine, seems sufficient, easy equation: 4x + 3x + 2x = 810, nothing special
step 2 - then you read statement #2 and realise that "oh wait, there was indeed nothing about people only being from USA, Europe and Asia, gotta rethink #1 and realise that there is another variable that makes #1 insufficient (4x + 3x +2x + "others" = 810) and a combination of #1 and #2 (nullifying that variable "others") sufficient.

Thats why this question is rather poor, but I'd say it is somewhat helpful in a way that you notice thise little quirks aka "but nothing was mentioned about other countries"

Even without statement (2) we cannot assume that there are no people from other parts of the world.

Hi Bunuel,

I understand your intent here to have questions with such traps but agreeing with what others have said above, I think this is not a GMAT like question.
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Joined: 08 Aug 2017
Posts: 28

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14 Apr 2018, 12:11
I disagree, this is very much like a GMAT question. Although, the second option gives away the catch (that is why this is a 500 level question), this question reiterates the fact that sometimes statement 2 has hints that can connect the dots. We must keep this in mind. For example, sometimes I do not grasp a DS problem just by reading Statement 1, but when I read statement 2 I can get a hint as to which direction the question is leaning towards. I hope you guys get the gist of the point I am making.
Re: M02-03   [#permalink] 14 Apr 2018, 12:11
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# M02-03

Moderators: chetan2u, Bunuel

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