Find all School-related info fast with the new School-Specific MBA Forum

It is currently 19 Apr 2014, 14:52

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If x and y are two points on the number line what is the

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
Joined: 05 Oct 2008
Posts: 275
Followers: 3

Kudos [?]: 24 [0], given: 22

GMAT Tests User
If x and y are two points on the number line what is the [#permalink] New post 23 Oct 2009, 23:04
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

49% (01:37) correct 50% (00:54) wrong based on 55 sessions
If x and y are two points on the number line what is the value of x + y?

(1) 6 is halfway between x and y

(2) y = 2x
[Reveal] Spoiler: OA

Last edited by Bunuel on 24 Apr 2012, 04:47, edited 1 time in total.
Edited the question and added the OA
Director
Director
User avatar
Joined: 01 Apr 2008
Posts: 911
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 10

Kudos [?]: 161 [0], given: 18

GMAT Tests User
Re: Number Line [#permalink] New post 24 Oct 2009, 04:04
IMO C.

stmt 1: x and y can be anything...(4,8) (5,7)....(-12,24).
stmt 2: y = 2x, again we can have (4,8) (5,10)...since 6 is not necessarily the midpoint of the line segment under consideration.

combining, 6+c = y = 2x, 6-c=x
adding these two equations, we get 12 = 3x => x = 4, y=8. This is the only possibility that satisfies both conditions.

However, if stmt 2 was something like: |y| = |2x|, then answer would have been E.
Manager
Manager
User avatar
Joined: 08 Oct 2009
Posts: 71
Location: Denmark, Europe
Schools: Darden Class of 2012
Followers: 1

Kudos [?]: 10 [0], given: 6

Re: Number Line [#permalink] New post 24 Oct 2009, 05:24
Yes, answer is C.

The first statement tells us that the average of X and Y is 6, i.e. (X+Y)/2=6 <=> X+Y=12
I.e. one equation in two unknowns => insufficient

The second equation is yet an equation in to unknowns => insufficient.

Combine the two statements to obtain 2x+3x = 3x = 12 <=> X=4 <=> Y=2*4=8.

So the answer is C.
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 17321
Followers: 2875

Kudos [?]: 18401 [0], given: 2350

GMAT Tests User CAT Tests
Re: Number Line [#permalink] New post 24 Oct 2009, 08:44
Expert's post
I have to disagree with C. The answer to the question must be A.

If x and y are two points on the number line what is the value of x + y?

(1) 6 is halfway between x and y. On the GMAT we often see such statement and it can ALWAYS be expressed algebraically as 6=\frac{x+y}{2} --> x+y=12. Remember we are asked to determine the value of x+y not x and y. Sufficient.

(2) y=2x. Clearly not sufficient

Answer: A.

Hope it's clear.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

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?
25 extra-hard Quant Tests

Director
Director
User avatar
Joined: 01 Apr 2008
Posts: 911
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 10

Kudos [?]: 161 [0], given: 18

GMAT Tests User
Re: Number Line [#permalink] New post 24 Oct 2009, 08:51
Agreed. It was my mistake. I didn't notice that all possible values of x and y will have a total =12, and that is what the question asks :(
Intern
Intern
Joined: 08 May 2011
Posts: 6
GMAT Date: 04-28-2012
Followers: 0

Kudos [?]: 0 [0], given: 3

GMAT Tests User
If x and y are two points on the number line what is the [#permalink] New post 23 Apr 2012, 21:20
If x and y are points on the number line, what is the value of x + y ?
(1) 6 is halfway between x and y.
(2) y = 2x

Ans: A
When we say 6 is midway between x and y it means among x and y one number is 6 + m and other is 6 - m thus sum of x and y is (6+m)+(6-m) thus 12 irrespective of the value of m..
VP
VP
User avatar
Status: I'm back and not stopping until I hit 760+
Joined: 06 Sep 2013
Posts: 1345
Location: United States
Concentration: Finance, General Management
Schools: Wharton '17
GPA: 3.5
WE: Corporate Finance (Investment Banking)
Followers: 7

Kudos [?]: 87 [0], given: 177

GMAT ToolKit User CAT Tests
Re: If x and y are two points on the number line what is the [#permalink] New post 28 Dec 2013, 04:48
study wrote:
If x and y are two points on the number line what is the value of x + y?

(1) 6 is halfway between x and y

(2) y = 2x


Question is asking for x+y

Statement 1 means that (x+y)/2 = 6

Hence x+y = 12

This is sufficient

Statement 2 is obviously not sufficient

Hence A

Cheers!
J :)
Re: If x and y are two points on the number line what is the   [#permalink] 28 Dec 2013, 04:48
    Similar topics Author Replies Last post
Similar
Topics:
Popular new posts If x and y are points on the number line, what is the value gluon 10 17 Nov 2007, 11:26
New posts IF X AND Y ARE POINTS ON THE NUMBER LINE WHAT IS THE VALUE Nihit 2 27 Sep 2008, 02:17
New posts If x and y are distinct points on a number line,and integer tejal777 1 20 Jul 2009, 04:22
New posts 3 Experts publish their posts in the topic If P and Q are two points on the line 3x + 4y =-15 such that kobinaot 9 21 Oct 2010, 05:47
New posts 3 Experts publish their posts in the topic What is the distance between x and y on the number line? calreg11 7 25 Mar 2012, 17:30
Display posts from previous: Sort by

If x and y are two points on the number line what is the

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.