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

It is currently 03 May 2015, 17:48

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

On the number line shown, is zero halfway between r and s ?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 08 Mar 2011
Posts: 25
Followers: 0

Kudos [?]: 15 [0], given: 31

Re: confusing [#permalink] New post 21 Mar 2011, 06:13
@ fluke....got it perfectly.......!!!
regards .....ill be posting some other queries too ......and i find ur solutions very helpful and self explanatory
thnx so much
1 KUDOS received
SVP
SVP
avatar
Joined: 16 Nov 2010
Posts: 1684
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 31

Kudos [?]: 342 [1] , given: 36

Premium Member Reviews Badge
Re: confusing [#permalink] New post 21 Mar 2011, 07:37
1
This post received
KUDOS
From (1), s is to the right of zero

But r can be to the right of zero as well.

From (2)

Case 1 - r = -s, and s is +ve

Case 2 - -s is towards right of t and -s is +ve, while s is -ve

So (2) is not sufficuent

But from (1) and (2), s is +ve, so r = -s.

Answer - C
_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

GMAT Club Premium Membership - big benefits and savings

Manager
Manager
avatar
Joined: 05 Jan 2011
Posts: 178
Followers: 3

Kudos [?]: 38 [0], given: 8

Re: confusing [#permalink] New post 21 Mar 2011, 07:51
fluke wrote:
punyadeep wrote:
Q)) On the number line shown, is zero halfway between r and s?
----r---- s---- t---
1). s is to the right of zero
2). the distance between t and r is the same as the distance between t and -s.


1)

Case I:
-----r--0--s----t---
0 is midway between r & s.

Case II:
--0--r----s----t---
0 is not midway between r & s.

Not Sufficient.

2)
Case I:
Let's say r=-s;
r=-2; s=2 t =3
-----r--0--s----t---
|t-r| = |3-(-2)|=5
|t-s| = |3-(-2)|=5
0 is midway between r and s.

Case II:
Let's say r=-s;
r=-4; s=-2 t =-1; -s=2
-----r--s--t--0----(-s)
|t-r| = |-1-(-4)|=3
|t-s| = |-1-(2)|=3
0 is not midway between r and s.
Not Sufficient.

Combining both;

r=-2; s=2 t =3
-----r--0--s----t---
|t-r| = |3-(-2)|=5
|t-s| = |3-(-2)|=5
0 is midway between r and s.

Sufficient.

Ans: "C"


Good post fluke...kudos to u
Expert Post
Verbal Forum Moderator
Verbal Forum Moderator
User avatar
Status: Preparing for the another shot...!
Joined: 03 Feb 2011
Posts: 1423
Location: India
Concentration: Finance, Marketing
GPA: 3.75
Followers: 144

Kudos [?]: 769 [0], given: 62

GMAT ToolKit User Premium Member
Re: confusing [#permalink] New post 28 Mar 2011, 02:45
Expert's post
Statement 1) if s is to the right of zero then 2 cases arrive
Case 1
-----0---r----s-----t-----
Case 2
-----r---0----s-----t-----
which to choose, hence insufficient

statement 2)
the distance b/w t & r is the same as the distance b/w t & -s
still 2 cases arrive
Case 1
r=-5, s=-3, t=-1, s=3
-----r---------s-------------------t-------------0--------------(+s)----- where +s=3
case 2
-----r------0------s---------------t---------------- r=-s


combining the two statements above,
its clear that 0 lies midway to r and s.

therefore C. :P :P :P :P :P
_________________

Prepositional Phrases Clarified|Elimination of BEING| Absolute Phrases Clarified
Rules For Posting
www.Univ-Scholarships.com

Current Student
avatar
Joined: 28 Apr 2011
Posts: 195
Followers: 0

Kudos [?]: 7 [0], given: 6

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 31 Mar 2012, 09:14
Graphical approch:-

1. s doesn't lead to answer.

2. 0 could be to the right of t i.e. assuming s to be -ve and -s to be positive
or 0 before s meaning r & -s are same point
(these are the only two cases as points could be on two sides of t or on same side of t)

1 & 2 together 0 can't be after t as so r=-s.
5 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 13 Aug 2012
Posts: 464
Concentration: Marketing, Finance
GMAT 1: Q V0
GPA: 3.23
Followers: 17

Kudos [?]: 257 [5] , given: 11

GMAT ToolKit User
Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 23 Jan 2013, 00:41
5
This post received
KUDOS
GIVEN: <=====(r)=====(s)===(t)=====>

1. s is to the right of 0

<=====(r)==(0)===(s)===(t)=====> Maybe!
<===(0)==(r)=====(s)===(t)=====> No!

INSUFFICIENT.

2. distance of r and t is equal to t and -s

<=====(r=-s)=====(s)===(t)=====> Yes!
<=====(r)=====(s)===(t)=======(-s)=> No!

INSUFFICIENT.

Together: Since s is to the right of 0 then -s is to the left of 0...
and |r-t| = |t+s| then r must be equal to -s...
<=====(r=-s)==(0)===(s)===(t)=====>

Yes!

SUFFICIENT.

Answer: C
_________________

Impossible is nothing to God.

Intern
Intern
avatar
Joined: 01 Mar 2011
Posts: 11
Followers: 0

Kudos [?]: 1 [0], given: 25

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 04 Apr 2013, 02:05
yangsta8 wrote:
mbaquestionmark wrote:
I have a question guys..

If -s is to the right of t, then wont r be equal to s ? But clearly in the picture, r and s are different points..

So dont u think that option is ruled out ? or is it like we should not go by the pic ? I know we should not go by the scale of the pic.. also this ?

Cos I thought the answer was B.. can someone please explain if I am wrong..

Thanks..


There's a couple of points to remember. Firstly never base your answer on how the diagrams look, they are representative but are by no means accurate. Because a triangle is drawn as equilateral for example, there is no reason to assume it is.

I think you've made a couple of incorrect assumptions in your reasoning:
1) -S is not necessarily to the right of T. Consider the case that 0 is between S and R. Then -S is negative meaning it is to the left of 0 and hence to the left of T. Your assumption is that 0 is on the right of S, but this isn't stated anywhere in Statement 2.
2) No answers state that R and S are the same point. Just that R = negative S.

Hope that clears it up.


hi Yangsta,
If 0 is between S and R, then there are two points(r and -s) on the left hand side of T which are distinct yet have the same distance from T?? how this is possible,,can u explain with an e.g if possible?
Manager
Manager
avatar
Joined: 08 Dec 2012
Posts: 51
Followers: 0

Kudos [?]: 10 [0], given: 12

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 11 Sep 2013, 01:24
Bunuel wrote:
Let me clear this one:

NOTE:
In GMAT we can often see such statement: \(k\) is halfway between \(m\) and \(n\). Remember this statement can ALWAYS be expressed as: \(\frac{m+n}{2}=k\).

Also in GMAT we can often see another statement: The distance between \(p\) and \(m\) is the same as the distance between \(p\) and \(n\). Remember this statement can ALWAYS be expressed as: \(|p-m|=|p-n|\).


Back to original question: is 0 halfway between r and s?
OR is \(\frac{r+s}{2}=0\)? --> Basically the question asks is \(r+s=0\)?

(1) \(s>0\), clearly not sufficient.

(2) The distance between \(t\) and \(r\) is the same as the distance between \(t\) and -\(s\): \(|t-r|=|t+s|\).

\(t-r\) is always positive as \(r\) is to the left of the \(t\), hence \(|t-r|=t-r\);

BUT \(t+s\) can be positive (when \(t>-s\), meaning \(t\) is to the right of -\(s\)) or negative (when \(t<-s\), meaning \(t\) is to the left of -\(s\), note that even in this case \(s\) would be to the left of \(t\) and relative position of the points shown on the diagram still will be the same). So we get either \(|t+s|=t+s\) OR \(|t+s|=-t-s\).

In another words: \(t+s\) is the sum of two numbers from which one \(t\), is greater than \(s\). Their sum clearly can be positive as well as negative. Knowing that one is greater than another doesn't help to determine the sign of their sum.

Hence:
\(t-r=t+s\) --> \(-r=s\);
OR
\(t-r=-t-s\) --> \(2t=r-s\).

So the only thing we can determine from (2) is: \(t-r=|t+s|\)
Not sufficient.

(1)+(2) \(s>0\) and \(t-r=|t+s|\). \(s>0\) --> \(t>0\) (as \(t\) is to the right of \(s\)) hence \(t+s>0\). Hence \(|t+s|=t+s\). --> \(t-r=t+s\) --> \(-r=s\). Sufficient.

Answer: C.


yangsta8 wrote:
Statement 2) This tells us that -S=R but it doesn't tell us anything to either S or R in relation to 0.


This is not correct. If we were able to determine that \(-s=r\), statement (2) would be sufficient. But from (2) we can only say that \(t-r=|t+s|\).


Economist wrote:
This is confusing.. Okay, let me put it this way: for number lines, if we have such points...do we trust the sign of the points? and their relative positioning ? Experts please comment.

eg. here, do we assume that s cannot be 0, as -s and s are supposed to be distinct +ve and -ve values.

also, do we trust the relative positioning ( not distance ) r-s-t as shown in figure?


As for \(s\) to be zero: from statement (1) we can say that \(s\) can not be zero as it states that \(s>0\).

For (2) we don't know whether -s=s=0 or not. If \(-s=s=0\), \(s\) and therefore -\(s\) are to the left of \(t\) and (2) would be sufficient in this case. But we don't know that.

About the relative position of the points on diagram. Do you remember the question about the two circles and point C? (ds-area-between-circles-85958.html) I didn't know at that time if we could trust the diagram about the C being in the circle or not. You said we should, and you were right. I asked this question to Ian Stewart and he gave me the explanation about the "trust" of the diagrams in GMAT:

"In general, you should not trust the scale of GMAT diagrams, either in Problem Solving or Data Sufficiency. It used to be true that Problem Solving diagrams were drawn to scale unless mentioned otherwise, but I've seen recent questions where that is clearly not the case. So I'd only trust a diagram I'd drawn myself. ...

Here I'm referring only to the scale of diagrams; the relative lengths of line segments in a triangle, for example. ... You can accept the relative ordering of points and their relative locations as given (if the vertices of a pentagon are labeled ABCDE clockwise around the shape, then you can take it as given that AB, BC, CD, DE and EA are the edges of the pentagon; if a line is labeled with four points in A, B, C, D in sequence, you can take it as given that AC is longer than both AB and BC; if a point C is drawn inside a circle, unless the question tells you otherwise, you can assume that C is actually within the circle; if what appears to be a straight line is labeled with three points A, B, C, you can assume the line is actually straight, and that B is a point on the line -- the GMAT would never include as a trick the possibility that ABC actually form a 179 degree angle that is imperceptible to the eye, to give a few examples).

So don't trust the lengths of lines, but do trust the sequence of points on a line, or the location of points within or outside figures in a drawing. "

Hope it helps.




mY DOUBT IS:

'The distance between t and r is the same as the distance between t and -s'

As per the number line,Does it not mean r=-s?and if r=-s it is implicit that o is half way.
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 27170
Followers: 4226

Kudos [?]: 40945 [0], given: 5576

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 11 Sep 2013, 02:03
Expert's post
SUNGMAT710 wrote:
Bunuel wrote:
Let me clear this one:

NOTE:
In GMAT we can often see such statement: \(k\) is halfway between \(m\) and \(n\). Remember this statement can ALWAYS be expressed as: \(\frac{m+n}{2}=k\).

Also in GMAT we can often see another statement: The distance between \(p\) and \(m\) is the same as the distance between \(p\) and \(n\). Remember this statement can ALWAYS be expressed as: \(|p-m|=|p-n|\).


Back to original question: is 0 halfway between r and s?
OR is \(\frac{r+s}{2}=0\)? --> Basically the question asks is \(r+s=0\)?

(1) \(s>0\), clearly not sufficient.

(2) The distance between \(t\) and \(r\) is the same as the distance between \(t\) and -\(s\): \(|t-r|=|t+s|\).

\(t-r\) is always positive as \(r\) is to the left of the \(t\), hence \(|t-r|=t-r\);

BUT \(t+s\) can be positive (when \(t>-s\), meaning \(t\) is to the right of -\(s\)) or negative (when \(t<-s\), meaning \(t\) is to the left of -\(s\), note that even in this case \(s\) would be to the left of \(t\) and relative position of the points shown on the diagram still will be the same). So we get either \(|t+s|=t+s\) OR \(|t+s|=-t-s\).

In another words: \(t+s\) is the sum of two numbers from which one \(t\), is greater than \(s\). Their sum clearly can be positive as well as negative. Knowing that one is greater than another doesn't help to determine the sign of their sum.

Hence:
\(t-r=t+s\) --> \(-r=s\);
OR
\(t-r=-t-s\) --> \(2t=r-s\).

So the only thing we can determine from (2) is: \(t-r=|t+s|\)
Not sufficient.

(1)+(2) \(s>0\) and \(t-r=|t+s|\). \(s>0\) --> \(t>0\) (as \(t\) is to the right of \(s\)) hence \(t+s>0\). Hence \(|t+s|=t+s\). --> \(t-r=t+s\) --> \(-r=s\). Sufficient.

Answer: C.


yangsta8 wrote:
Statement 2) This tells us that -S=R but it doesn't tell us anything to either S or R in relation to 0.


This is not correct. If we were able to determine that \(-s=r\), statement (2) would be sufficient. But from (2) we can only say that \(t-r=|t+s|\).


Economist wrote:
This is confusing.. Okay, let me put it this way: for number lines, if we have such points...do we trust the sign of the points? and their relative positioning ? Experts please comment.

eg. here, do we assume that s cannot be 0, as -s and s are supposed to be distinct +ve and -ve values.

also, do we trust the relative positioning ( not distance ) r-s-t as shown in figure?


As for \(s\) to be zero: from statement (1) we can say that \(s\) can not be zero as it states that \(s>0\).

For (2) we don't know whether -s=s=0 or not. If \(-s=s=0\), \(s\) and therefore -\(s\) are to the left of \(t\) and (2) would be sufficient in this case. But we don't know that.

About the relative position of the points on diagram. Do you remember the question about the two circles and point C? (ds-area-between-circles-85958.html) I didn't know at that time if we could trust the diagram about the C being in the circle or not. You said we should, and you were right. I asked this question to Ian Stewart and he gave me the explanation about the "trust" of the diagrams in GMAT:

"In general, you should not trust the scale of GMAT diagrams, either in Problem Solving or Data Sufficiency. It used to be true that Problem Solving diagrams were drawn to scale unless mentioned otherwise, but I've seen recent questions where that is clearly not the case. So I'd only trust a diagram I'd drawn myself. ...

Here I'm referring only to the scale of diagrams; the relative lengths of line segments in a triangle, for example. ... You can accept the relative ordering of points and their relative locations as given (if the vertices of a pentagon are labeled ABCDE clockwise around the shape, then you can take it as given that AB, BC, CD, DE and EA are the edges of the pentagon; if a line is labeled with four points in A, B, C, D in sequence, you can take it as given that AC is longer than both AB and BC; if a point C is drawn inside a circle, unless the question tells you otherwise, you can assume that C is actually within the circle; if what appears to be a straight line is labeled with three points A, B, C, you can assume the line is actually straight, and that B is a point on the line -- the GMAT would never include as a trick the possibility that ABC actually form a 179 degree angle that is imperceptible to the eye, to give a few examples).

So don't trust the lengths of lines, but do trust the sequence of points on a line, or the location of points within or outside figures in a drawing. "

Hope it helps.




mY DOUBT IS:

'The distance between t and r is the same as the distance between t and -s'

As per the number line,Does it not mean r=-s?and if r=-s it is implicit that o is half way.


Please read the red part of the post you quote.
_________________

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

GMAT Club Premium Membership - big benefits and savings

Intern
Intern
avatar
Joined: 12 Dec 2011
Posts: 14
Location: Italy
Concentration: Finance, Entrepreneurship
GMAT Date: 04-09-2013
GPA: 4
WE: Management Consulting (Consulting)
Followers: 0

Kudos [?]: 13 [0], given: 5

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 28 Sep 2013, 00:33
On the number line shown, is zero halfway between r and s?

(1) s is to the right of zero
(2) The distance between t and r is the same as the distance between t and -s
Attachments

Question.PNG
Question.PNG [ 15.92 KiB | Viewed 1360 times ]

Expert Post
Moderator
Moderator
User avatar
Status: It always seems impossible until it's done!!
Joined: 29 Aug 2012
Posts: 527
Location: India
Followers: 33

Kudos [?]: 485 [0], given: 154

GMAT ToolKit User Premium Member CAT Tests
Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 28 Sep 2013, 01:24
Expert's post
marioslash wrote:
Hi guys,
Does anyone explain in detail this question?

Thanks in advance


Statement 1: only says S is positive - Not sufficient.

Statement 2: says R= - S, Nothing much- Not sufficient.

Together: S= +ve, and -S=R. the distance between S and 0 and -S and 0 is equal, & thus R & 0..

So both statement together is sufficient (C).
_________________

Believe you can and you're halfway there- Theodore Roosevelt


Rules for posting in Quants Forum || Rules for posting in verbal forum

Connect With me Via LinkedIn | My Blog |

Bunuel Special Problem Collections New!! || Version-2 SC- 9 Most common Errors New!!
Version-2- CR- 10 Most common ErrorsNew!! || Reading Comprehension- Review/PraciceNew!!


Get the best GMAT Prep Resources with GMAT Club Premium Membership

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 27170
Followers: 4226

Kudos [?]: 40945 [0], given: 5576

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 28 Sep 2013, 03:40
Expert's post
marioslash wrote:
On the number line shown, is zero halfway between r and s?

(1) s is to the right of zero
(2) The distance between t and r is the same as the distance between t and -s


Merging similar topics. Please refer to the solutions provided on page 1.

P.S. Please read and follow: rules-for-posting-please-read-this-before-posting-133935.html Pay attention to the rules #3 and 6. Thank you.
_________________

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

GMAT Club Premium Membership - big benefits and savings

SVP
SVP
User avatar
Joined: 06 Sep 2013
Posts: 2035
Concentration: Finance
GMAT 1: 710 Q48 V39
Followers: 24

Kudos [?]: 294 [0], given: 354

GMAT ToolKit User
Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 29 Mar 2014, 08:30
I still don't quite get statement 2

I'm looking at the diagram and the statement and it seems clear that r must be = -s. And therefore zero is in the middle hence answer is sufficient

Also trying when r>s>t and so r=-s, but still 0 is still between s and r and answer is still yes

Is there any case I am missing, could someone please illustrate in number line

Bonus question: I read B's explanation about what IanStewart mentioned regarding graphs in PS, DS and all that stuff mentioning that we could trust the relative position of points in the diagram. Hence in this case r>s>t always?

Thanks!
Would throw a lot of Kudos for this
Cheers
J
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 27170
Followers: 4226

Kudos [?]: 40945 [0], given: 5576

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 29 Mar 2014, 09:04
Expert's post
jlgdr wrote:
I still don't quite get statement 2

I'm looking at the diagram and the statement and it seems clear that r must be = -s. And therefore zero is in the middle hence answer is sufficient

Also trying when r>s>t and so r=-s, but still 0 is still between s and r and answer is still yes

Is there any case I am missing, could someone please illustrate in number line

Bonus question: I read B's explanation about what IanStewart mentioned regarding graphs in PS, DS and all that stuff mentioning that we could trust the relative position of points in the diagram. Hence in this case r>s>t always?

Thanks!
Would throw a lot of Kudos for this
Cheers
J


Image
First of all, the question asks whether 0 is halfway between r and s, not just between r and s.

Below is the case for (2) when 0 is NOT halfway between r and s.
(2) The distance between t and r is the same as the distance between t and -s

--r-------s---t-----------(-s)



Here s is negative, -s is positive and 0 is somewhere between t and -s.

As for your second question: from the diagram we can infer that \(t>s>r\), not that \(r>s>t\).

OG13, page 272:
A figure accompanying a data sufficiency problem will conform to the information given in the question but will not necessarily conform to the additional information given in statements (1) and (2).
Lines shown as straight can be assumed to be straight and lines that appear jagged can also be assumed to be straight.
You may assume that the positions of points, angles, regions, and so forth exist in the order shown and that angle measures are greater than zero degrees.
All figures lie in a plane unless otherwise indicated.

OG13, page 150:
Figures: A figure accompanying a problem solving question is intended to provide information useful in solving the problem. Figures are drawn as accurately as possible. Exceptions will be clearly noted. Lines shown as straight are straight, and lines that appear jagged are also straight. The positions of points, angles, regions, etc., exist in the order shown, and angle measures are greater than zero. All figures lie in a plane unless otherwise indicated.

Hope it helps.
_________________

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

GMAT Club Premium Membership - big benefits and savings

Moderator
Moderator
User avatar
Joined: 25 Apr 2012
Posts: 734
Location: India
GPA: 3.21
WE: Business Development (Other)
Followers: 26

Kudos [?]: 419 [0], given: 723

Premium Member Reviews Badge
Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 21 Jun 2014, 06:14
DenisSh wrote:
Attachment:
Number line.PNG
On the number line shown, is zero halfway between r and s?

(1) s is to the right of zero
(2) The distance between t and r is the same as the distance between t and -s



Hi Bunuel,

Got this question incorrect on GMAT prep test and thus looked at your solution....

Initially, I tried to do the question by myself and here is what I did

The Question basically asks us whether 0 is between r and s or |r-0|=|s-0| or |r|=|s| or r= s or -s
(Now, if r=s then answer is no but if r=-s then answer is yes...But I think I did apply the mod statement correctly so in this case do we reject the case of r=s at this stage itself and reduce the question to if r=-s )
St 1 says s>0 not much help here as r can be placed to the right of zero or left or at zero. Not sufficient
St 2 says |t-r|=|t+s|
This can be interpreted in one of the 2 ways

t-r = t+s or t-r= -(t+s)

So we get either r=-s or 2t=r+s

Not sufficient.

combining we see that r=-s and s>0 therefore r<0 and r=-s which is same
_________________


“If you can't fly then run, if you can't run then walk, if you can't walk then crawl, but whatever you do you have to keep moving forward.”

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 27170
Followers: 4226

Kudos [?]: 40945 [0], given: 5576

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 21 Jun 2014, 07:22
Expert's post
WoundedTiger wrote:
DenisSh wrote:
Attachment:
Number line.PNG
On the number line shown, is zero halfway between r and s?

(1) s is to the right of zero
(2) The distance between t and r is the same as the distance between t and -s



Hi Bunuel,

Got this question incorrect on GMAT prep test and thus looked at your solution....

Initially, I tried to do the question by myself and here is what I did

The Question basically asks us whether 0 is between r and s or |r-0|=|s-0| or |r|=|s| or r= s or -s
(Now, if r=s then answer is no but if r=-s then answer is yes...But I think I did apply the mod statement correctly so in this case do we reject the case of r=s at this stage itself and reduce the question to if r=-s )
St 1 says s>0 not much help here as r can be placed to the right of zero or left or at zero. Not sufficient
St 2 says |t-r|=|t+s|
This can be interpreted in one of the 2 ways

t-r = t+s or t-r= -(t+s)

So we get either r=-s or 2t=r+s

Not sufficient.

combining we see that r=-s and s>0 therefore r<0 and r=-s which is same


Image
On the number line shown, is zero halfway between r and s?

\(k\) is halfway between \(m\) and \(n\) can ALWAYS be expressed as: \(\frac{m+n}{2}=k\).

Is 0 halfway between r and s? --> is \(\frac{r+s}{2}=0\)? --> \(r+s=0\).

The question asks whether we have the following case:

--r---0---s---t--



(1) s is to the right of zero. Clearly insufficient.

(2) The distance between t and r is the same as the distance between t and -s

If s < 0, then we'd have the following case:

--r-------s---t---0-------(-s)

Answer NO.

If s > 0, then we'd have the following case:

--r---0---s---t-------------

Answer YES. Notice that in this case r and -s coincide.

Not sufficient.

(1) + (2) We have the second case from (2). Sufficient.

Answer: C.
_________________

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

GMAT Club Premium Membership - big benefits and savings

Manager
Manager
User avatar
Joined: 08 Jul 2010
Posts: 56
GMAT: INSIGHT
Followers: 2

Kudos [?]: 26 [0], given: 1

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 28 Oct 2014, 03:54
Answer: Option C
Attachments

File comment: Answer: Option C
1.jpg
1.jpg [ 152.21 KiB | Viewed 363 times ]

1.jpg
1.jpg [ 152.21 KiB | Viewed 366 times ]


_________________

---
Prosper!!!
Bhoopendra Singh & Sushma Jha
"GMATinsight"
http://www.GMATinsight.com/contacts.html
ForOne-on-One FREE ONLINE SKYE BASED DEMO Class Call/e-mail
e-mail: info@GMATinsight.com

Intern
Intern
avatar
Joined: 05 Sep 2014
Posts: 8
Followers: 0

Kudos [?]: 0 [0], given: 4

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 19 Nov 2014, 14:44
Bunnel,

Can you please help me understand where I'm going wrong?

Can you help me with one more problem?

Where am I going wrong?

On the number line shown, is zero halfway between r and s?

(1) s is to the right of zero
(2) The distance between t and r is the same as the distance between t and -s

on-the-number-line-shown-is-zero-halfway-between-r-and-s-89015.html


Statement 1

s is to the right of zero

------r------0--s No
r----0----s Yes


Statement 2

The distance between t and r is the same as the distance between t and -s

-s --- t ---r ---- 0 ---------s (taking numbers as below)
-10(s) --- -7(t) --- -4(r) ---- 0 -------------- -10 (s)
No

-4(r=-s)----- 0(t) ------4 (S)
Yes

So both statements insuff.

Cheers,
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 27170
Followers: 4226

Kudos [?]: 40945 [0], given: 5576

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 20 Nov 2014, 07:33
Expert's post
annie2014 wrote:
Bunnel,

Can you please help me understand where I'm going wrong?

Can you help me with one more problem?

Where am I going wrong?

On the number line shown, is zero halfway between r and s?

(1) s is to the right of zero
(2) The distance between t and r is the same as the distance between t and -s

on-the-number-line-shown-is-zero-halfway-between-r-and-s-89015.html


Statement 1

s is to the right of zero

------r------0--s No
r----0----s Yes


Statement 2

The distance between t and r is the same as the distance between t and -s

-s --- t ---r ---- 0 ---------s (taking numbers as below)
-10(s) --- -7(t) --- -4(r) ---- 0 -------------- -10 (s)
No

-4(r=-s)----- 0(t) ------4 (S)
Yes

So both statements insuff.

Cheers,


Notice that the stem gives relative positioning of the point as r --- s --- t:

Image
_________________

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

GMAT Club Premium Membership - big benefits and savings

Expert Post
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 5449
Location: Pune, India
Followers: 1331

Kudos [?]: 6775 [0], given: 177

Re: On the number line shown, is zero halfway between r and s ? [#permalink] New post 20 Nov 2014, 20:25
Expert's post
Responding to a pm:
Quote:
Statement 1
s is to the right of zero

------r------0--s No
r----0----s Yes


Statement 2

The distance between t and r is the same as the distance between t and -s

-s --- t ---r ---- 0 ---------s (taking numbers as below)
-10(s) --- -7(t) --- -4(r) ---- 0 -------------- -10 (s)
No

-4(r=-s)----- 0(t) ------4 (S)


Go to the original post on this thread. Check out the diagram given with the question.
"On the number line shown...."
This tells you that r, s and t are on the number line in that order.
r to the left of s and s to the left of t.
So the cases you have taken are not valid since you have changed the relative positions of r, s and t.
_________________

Karishma
Veritas Prep | GMAT Instructor
My Blog

Veritas Prep GMAT course is coming to India. Enroll in our weeklong Immersion Course that starts March 29!

Veritas Prep Reviews

Re: On the number line shown, is zero halfway between r and s ?   [#permalink] 20 Nov 2014, 20:25

Go to page   Previous    1   2   3    Next  [ 45 posts ] 

    Similar topics Author Replies Last post
Similar
Topics:
On the number line shown, is zero halfway between r and s? marioslash 0 28 Sep 2013, 01:24
On the number line shown, is zero halfway between r and s? punyadeep 0 16 Jan 2015, 06:04
Untitled.jpg On the number line shown, is zero halfway uzonwagba 4 27 Jul 2009, 01:56
On the number line shown, is zero halfway between r and s vksunder 5 06 Apr 2009, 08:43
On the number line <r> Is zero halfway between r and s gluon 2 27 Oct 2007, 19:24
Display posts from previous: Sort by

On the number line shown, is zero halfway between r and s ?

  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®.