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If a, b, c are three numbers on the number line shown above

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If a, b, c are three numbers on the number line shown above [#permalink] New post 25 Aug 2012, 01:49
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A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

60% (02:05) correct 40% (01:22) wrong based on 154 sessions
Attachment:
Number Line.png
Number Line.png [ 8.29 KiB | Viewed 6159 times ]
If a, b, c are three numbers on the number line shown above , is c between a and b.

(1) b < 0
(2) a - b > c
[Reveal] Spoiler: OA

Last edited by Bunuel on 21 Jan 2013, 02:27, edited 3 times in total.
Added the diagram.
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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 25 Aug 2012, 02:27
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Image
If a, b, c are three numbers on the number line shown above , is c between a and b.

Probably the best way to solve this problem is to pick some smart numbers. Notice that from the diagram we have that a<b.

(1) b <0. Clearly insufficient since we know nothing about c.

(2) a-b>c. If a=-10 and b=-1, then -10-(-1)=-9>c. Now, is c=-9.5, then the answer is YES but if c=-100, then the answer is NO. Not sufficient.

(1)+(2) Example from (2) is still valid, so even when we consider the two statements together we cannot answer the question. Not sufficient.

Answer: E.
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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 25 Aug 2012, 03:18
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Attachment:
The attachment Number Line.png is no longer available
If a, b, c are three numbers on the number line shown above , is c between a and b.

(1) b <0
(2) a-b>c


For (1) and (2):
From (2), we know that 0>a-b>c and from (1) that b<0.
Place a,b and a-b on the number line (see the attached drawing).
You can see that c can be between a and a-b (which means that c is between a and b) or on the left of a (meaning c is not between and b).
Not sufficient.

Answer E.
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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 19 Oct 2012, 01:08
Bunuel wrote:
Image
If a, b, c are three numbers on the number line shown above , is c between a and b.

Probably the best way to solve this problem is to pick some smart numbers. Notice that from the diagram we have that a<b.

(1) b <0. Clearly insufficient since we know nothing about c.

(2) a-b>c. If a=-10 and b=-1, then -10-(-1)=-9>c. Now, is c=-9.5, then the answer is YES but if c=-100, then the answer is NO. Not sufficient.

(1)+(2) Example from (2) is still valid, so even when we consider the two statements together we cannot answer the question. Not sufficient.

Answer: E.


Bunuel I also interpret that from diagram a<b but in the official explanation they took a=0 and b =-2 :-D isnt it strange?
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a.jpg [ 52.14 KiB | Viewed 4954 times ]


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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 19 Oct 2012, 09:44
Hi Gurpreet, in your screenshot I dont see the line segment where points 'A' and 'B' are marked like in the original question. In the original question the line segment is given with the points positioned in it. So that makes a difference. These questions are similar, not identical.
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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 19 Oct 2012, 10:44
1022lapog wrote:
Hi Gurpreet, in your screenshot I dont see the line segment where points 'A' and 'B' are marked like in the original question. In the original question the line segment is given with the points positioned in it. So that makes a difference. These questions are similar, not identical.


I have not posted the real question. I have just posted the explanation. And the question is exactly same.
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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 23 Oct 2012, 06:07
Expert's post
gurpreetsingh wrote:
Bunuel wrote:
Image
If a, b, c are three numbers on the number line shown above , is c between a and b.

Probably the best way to solve this problem is to pick some smart numbers. Notice that from the diagram we have that a<b.

(1) b <0. Clearly insufficient since we know nothing about c.

(2) a-b>c. If a=-10 and b=-1, then -10-(-1)=-9>c. Now, is c=-9.5, then the answer is YES but if c=-100, then the answer is NO. Not sufficient.

(1)+(2) Example from (2) is still valid, so even when we consider the two statements together we cannot answer the question. Not sufficient.

Answer: E.


Bunuel I also interpret that from diagram a<b but in the official explanation they took a=0 and b =-2 :-D isnt it strange?


Taking into consideration the diagram in the question, it's not strange it's just wrong.
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if a,b and c are three numbers on the number line shown abov [#permalink] New post 20 Jan 2013, 19:58
<-------a-----------b-------------->


if a,b and c are three numbers on the number line shown above, is C between a and b?

1) b<0
2) a-b>c
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Re: if a,b and c are three numbers on the number line shown abov [#permalink] New post 20 Jan 2013, 21:46
fozzzy wrote:
<-------a-----------b-------------->


if a,b and c are three numbers on the number line shown above, is C between a and b?

1) b<0
2) a-b>c


Answer is E.
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Re: if a,b and c are three numbers on the number line shown abov [#permalink] New post 21 Jan 2013, 02:29
Expert's post
fozzzy wrote:
<-------a-----------b-------------->


if a,b and c are three numbers on the number line shown above, is C between a and b?

1) b<0
2) a-b>c


Merging similar topics. Please refer to the solutions above.
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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 21 Jan 2013, 02:49
Any tips on how to pick smart numbers for this question?
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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 18 Apr 2014, 06:52
I have a question here if I may

Should we assume that a,b are given in order, that is as shown in the number line? I understood that one should trust the order of points shown either on number lines or graphs according to GMAT

Please confirm
Thanks!
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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 18 Apr 2014, 09:12
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jlgdr wrote:
I have a question here if I may

Should we assume that a,b are given in order, that is as shown in the number line? I understood that one should trust the order of points shown either on number lines or graphs according to GMAT

Please confirm
Thanks!
Cheers
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Yes, from the diagram we can derive that a<b.
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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.


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Re: If a, b, c are three numbers on the number line shown above [#permalink] New post 08 May 2014, 05:34
I did it this way

Note: One can trust the relative position of graphs/lines in DS as per OG.

Statement 1:

b<0. Clearly Insufficient

Statement 2:

a-b>c --> a>b+c

Insufficient again

Both (1) and (2) together

Let's pick some numbers.

Since b<0 and b>a, then let's say a=-2 and b=-1

Now then replacing we have that c<-1.
Thus 'c' could be either between 'a' and 'b' or to the left of 'a'

Answer: E

Hope it helps
Cheers!
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Re: If a, b, c are three numbers on the number line shown above   [#permalink] 08 May 2014, 05:34
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