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

 It is currently 03 May 2015, 22:22

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Is a = b c? (1) c = a + b (2) a < 0

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Manager
Joined: 20 Nov 2009
Posts: 169
Followers: 7

Kudos [?]: 65 [0], given: 64

Is a = b c? (1) c = a + b (2) a < 0 [#permalink]  22 Jul 2010, 12:06
1
This post was
BOOKMARKED
00:00

Difficulty:

45% (medium)

Question Stats:

63% (01:55) correct 37% (00:58) wrong based on 79 sessions
Is ┃a┃ = b – c?

(1) c = a + b

(2) a < 0
[Reveal] Spoiler: OA

_________________

But there’s something in me that just keeps going on. I think it has something to do with tomorrow, that there is always one, and that everything can change when it comes.
http://aimingformba.blogspot.com

Math Expert
Joined: 02 Sep 2009
Posts: 27170
Followers: 4226

Kudos [?]: 40957 [1] , given: 5576

Re: DS question [#permalink]  22 Jul 2010, 12:29
1
KUDOS
Expert's post
aiming4mba wrote:
Is ┃a┃ = b – c?

(1) c = a + b

(2) a < 0

If $$a<0$$ it must be true that $$-a=b-c$$;
If $$a\geq{0}$$ it must be true that $$a=b-c$$.

(1) $$c=a+b$$ --> $$-a=b-c$$. But we don't know whether $$a<0$$. Not sufficient.
(2) $$a<0$$. Question becomes is $$-a=b-c$$? We don't know that. Not sufficient.

(1)+(2) Form 2: $$a<0$$, question becomes is $$-a=b-c$$? Statement 1 confirms this. Sufficient.

Answer: C. (similar topic: abs-equation-from-gmatprep-84821.html)
_________________
Manager
Joined: 16 Feb 2010
Posts: 225
Followers: 2

Kudos [?]: 116 [0], given: 16

Re: DS question [#permalink]  22 Jul 2010, 14:25
aiming4mba wrote:
Is ┃a┃ = b – c?

(1) c = a + b

(2) a < 0

why not (A)?

-a = b-c
therefore b-c = |a|......
Intern
Joined: 24 Mar 2010
Posts: 49
Followers: 0

Kudos [?]: 12 [1] , given: 3

Re: DS question [#permalink]  22 Jul 2010, 15:06
1
KUDOS
Quote:
why not (A)?

-a = b-c
therefore b-c = |a|......

If b-c=-a, then lal=-(b-c), or c-b=lal, which does not answer our original question, b-c=lal.

Thanks,

Jared
Manager
Joined: 07 Dec 2011
Posts: 174
Location: India
Followers: 1

Kudos [?]: 33 [0], given: 24

Re: Is a = b c? (1) c = a + b (2) a < 0 [#permalink]  10 Oct 2012, 11:06
Is this approach correct?

For ┃a┃ = b – c to be true , (b - c ) >=0 ie positive

(1) c = a + b : for (b - c ) >=0 to be true a needs to be <=0. Not given, hence insufficient
(2) a < 0, says nothing about (b - c ) >=0 Hence insufficient
(1)+(2) proves b - c>=0. Sufficient.
Re: Is a = b c? (1) c = a + b (2) a < 0   [#permalink] 10 Oct 2012, 11:06
Similar topics Replies Last post
Similar
Topics:
Is |a| = b - c ? (1) a + c != b (2) a < 0 12 23 May 2011, 18:33
2 is (a-b)/c >0? 1. a>b, b<c 2. a<b, b<c 2 07 Nov 2010, 12:44
1 If [(a-b)/c] < 0, is a > b ? (1) c < 0 (2) a+b < 0 3 31 May 2010, 09:59
If A = {B}/{C} , is A> B 1. 0< C <1 2. A > 0 3 28 Aug 2008, 10:52
Is A^5 * b^2 * C^3 > 0 (1) B*C *LT 0 (2) A*C *GT 0 4 21 May 2007, 02:19
Display posts from previous: Sort by

# Is a = b c? (1) c = a + b (2) a < 0

 Question banks Downloads My Bookmarks Reviews Important topics

 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®.