Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 44566

1
This post received KUDOS
Expert's post
1
This post was BOOKMARKED
Question Stats:
73% (00:35) correct 27% (00:42) wrong based on 146 sessions
HideShow timer Statistics



Math Expert
Joined: 02 Sep 2009
Posts: 44566

Re M0203 [#permalink]
Show Tags
16 Sep 2014, 00:17
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. Answer: C
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Intern
Joined: 19 Aug 2014
Posts: 4

Re M0203 [#permalink]
Show Tags
27 Jan 2015, 10:20
I think this question is poor and not helpful.



Math Expert
Joined: 02 Sep 2009
Posts: 44566

Re: M0203 [#permalink]
Show Tags
27 Jan 2015, 10:24



Manager
Joined: 17 Mar 2015
Posts: 121

Re: M0203 [#permalink]
Show Tags
18 Mar 2015, 00:53
1
This post was BOOKMARKED
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"



Intern
Joined: 17 Aug 2014
Posts: 1

Re: M0203 [#permalink]
Show Tags
11 Aug 2015, 20:49
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.



Math Expert
Joined: 02 Sep 2009
Posts: 44566

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.
_________________
New to the Math Forum? Please read this: Ultimate GMAT Quantitative Megathread  All You Need for Quant  PLEASE READ AND FOLLOW: 12 Rules for Posting!!! Resources: GMAT Math Book  Triangles  Polygons  Coordinate Geometry  Factorials  Circles  Number Theory  Remainders; 8. Overlapping Sets  PDF of Math Book; 10. Remainders  GMAT Prep Software Analysis  SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS)  Tricky questions from previous years.
Collection of Questions: PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.
What are GMAT Club Tests? Extrahard Quant Tests with Brilliant Analytics



Director
Joined: 21 May 2013
Posts: 621

Re: M0203 [#permalink]
Show Tags
20 Aug 2015, 12:00
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.



Intern
Joined: 08 Aug 2017
Posts: 10

Re: M0203 [#permalink]
Show Tags
14 Apr 2018, 13:11
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.










