How far is A from C? : GMAT Data Sufficiency (DS)
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How far is A from C?

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Manager
Joined: 02 Jun 2011
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How far is A from C? [#permalink]

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20 Jun 2012, 11:14
00:00

Difficulty:

5% (low)

Question Stats:

80% (01:17) correct 20% (00:16) wrong based on 127 sessions

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How far is A from C?

(1) A is 10 miles from D
(2) C is 3 miles from D
[Reveal] Spoiler: OA
Joined: 28 Mar 2012
Posts: 314
Location: India
GMAT 1: 640 Q50 V26
GMAT 2: 660 Q50 V28
GMAT 3: 730 Q50 V38
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Kudos [?]: 398 [0], given: 23

Re: How far is A from C? [#permalink]

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20 Jun 2012, 11:22
Hi,

From (1)
A is 10 miles from D,

From (2)
C is 3 miles from D.

Using both,
A, C & D can be positioned in any direction. Thus, Insufficient.

This doesn't appear to be a GMAT question.
I believe you are looking for following type of question:
http://gmatclub.com/forum/the-points-a-b-c-and-d-are-on-a-number-line-not-83389.html

Regards,
Manager
Joined: 02 Jun 2011
Posts: 159
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Kudos [?]: 75 [0], given: 11

Re: How far is A from C? [#permalink]

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20 Jun 2012, 11:47
Hi,

From (1)
A is 10 miles from D,

From (2)
C is 3 miles from D.

Using both,
A, C & D can be positioned in any direction. Thus, Insufficient.

This doesn't appear to be a GMAT question.

I believe you are looking for following type of question:
http://gmatclub.com/forum/the-points-a-b-c-and-d-are-on-a-number-line-not-83389.html

Regards,

a kaplan practice question.
i truly don,t have an idea whats actual GMAT type question. may be not.
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Re: How far is A from C? [#permalink]

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20 Jun 2012, 23:42
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Expert's post
kashishh wrote:
How far is A from C?

(1) A is 10 miles from D
(2) C is 3 miles from D

Each statement alone is clearly insufficient. When we consider them together, even if we say that A, D, and C are collinear, we can still have different answers. Look at the diagram below:
Attachment:

ADC.png [ 2.58 KiB | Viewed 2473 times ]
For the first case the answer is 13 miles and for the second case the answer is 7 miles.

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Re: How far is A from C? [#permalink]

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21 Jun 2012, 11:19

This doesn't appear to be a GMAT question.
I believe you are looking for following type of question:
http://gmatclub.com/forum/the-points-a-b-c-and-d-are-on-a-number-line-not-83389.html

Regards,

Hi cyberjagudar!

Thanks for the explantion--you covered it well! You seem to be strong at math, which is probably why our practice questions doesn't look test like to you--you haven't seen ones of that low difficulty. But remember, the test is adaptive! Folks who are still early in their prep and struggling with their math scores will likely see easier problems than the ones you're used to until they refresh their math skills from high-school and start getting early questions consistently correct.

Hope this helps!
_________________

Eli Meyer
Kaplan Teacher
http://www.kaptest.com/GMAT

Prepare with Kaplan and save \$150 on a course!

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Joined: 28 Mar 2012
Posts: 314
Location: India
GMAT 1: 640 Q50 V26
GMAT 2: 660 Q50 V28
GMAT 3: 730 Q50 V38
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Re: How far is A from C? [#permalink]

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22 Jun 2012, 00:16
KapTeacherEli wrote:

This doesn't appear to be a GMAT question.
I believe you are looking for following type of question:
http://gmatclub.com/forum/the-points-a-b-c-and-d-are-on-a-number-line-not-83389.html

Regards,

Hi cyberjagudar!

Thanks for the explantion--you covered it well! You seem to be strong at math, which is probably why our practice questions doesn't look test like to you--you haven't seen ones of that low difficulty. But remember, the test is adaptive! Folks who are still early in their prep and struggling with their math scores will likely see easier problems than the ones you're used to until they refresh their math skills from high-school and start getting early questions consistently correct.

Hope this helps!

Hi,

Well, I would say that the mentioned question is not an easy one, only due to the fact that there are many possibilities for position of A, B & C. If they were collinear there would be some restriction on the total number of cases.

Regards,
Manager
Joined: 02 Jun 2011
Posts: 159
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Re: How far is A from C? [#permalink]

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24 Jun 2012, 13:24

i did this particular quest. and in 5 sec. chose 'c' - obviously wrong!
i think more than i didn't understand the question, i hurried and on my part a silly mistake.
i posted it more for the tricky part of it (atleast i felt so)!

thanx cyberjadugar for putting it right and for the link. it is always good to get direction and guidance. truly thanx,
i learnt.

Thnx Mr. Eli n Thanx to Kaplan to give such brush ups for people like me.
I mentioned Kaplan just and just to cite the importance of the question.

regards,
Senior Manager
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Re: How far is A from C? [#permalink]

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01 Aug 2013, 13:45
How far is A from C?

The first thing we should note is that the GMAT is tricky. It's natural to assume that A,B,C and D appear in the linear order they do in the alphabet. However, this isn't specified in the stem thus it cannot be assumed.

(1) A is 10 miles from D
This tells us nothing about B.
INSUFFICIENT

(2) C is 3 miles from D
This tells us nothing about A.
INSUFFICIENT

1+2)

There are two cases here:

(0mi) A=======C===D (10mi)
In this case, C would be located 7mi away from A.
OR
A==========D===C
In this case, C would be located 13mi away from A.
INSUFFICIENT.

(E)
Re: How far is A from C?   [#permalink] 01 Aug 2013, 13:45
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