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

It is currently 27 Sep 2016, 02:34
GMAT Club Tests

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 a, b, and c are positive, is a + b > c?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Manager
Manager
avatar
Joined: 25 Jul 2012
Posts: 78
Location: United States
Followers: 0

Kudos [?]: 76 [0], given: 137

If a, b, and c are positive, is a + b > c? [#permalink]

Show Tags

New post 14 Aug 2012, 21:26
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

71% (01:43) correct 29% (00:58) wrong based on 48 sessions

HideShow timer Statistics

If a, b, and c are positive, is a + b > c?

(1) a/c > b > 1

(2) ab > ac


[Reveal] Spoiler:
Can anyone explain why this is D?


I understand
1)[a/c]>b>1 =a>bc>c, so a>c, sufficient

I dont understand: "b must remain positive so a+b>c". Can someone explain to me what this means or what property they are referring to?

2)ab>ac = b>c, sufficient
same vice/versa explanation here: "a must remain positive so a+b>c" Need this one explained too.

Thanks

Also, does anyone know similar problems to this in the OG13? I need to practice these types of questions, especially in DS. Thanks
[Reveal] Spoiler: OA

_________________

If my post has contributed to your learning or teaching in any way, feel free to hit the kudos button ^_^


Last edited by Bunuel on 14 Aug 2012, 23:30, edited 1 time in total.
Edited the question.
1 KUDOS received
Director
Director
User avatar
Status: Tutor - BrushMyQuant
Joined: 05 Apr 2011
Posts: 576
Location: India
Concentration: Finance, Marketing
Schools: XLRI (A)
GMAT 1: 570 Q49 V19
GMAT 2: 700 Q51 V31
GPA: 3
WE: Information Technology (Computer Software)
Followers: 93

Kudos [?]: 513 [1] , given: 53

Re: If a, b, and c are positive, is a + b > c? [#permalink]

Show Tags

New post 14 Aug 2012, 21:45
1
This post received
KUDOS
If a, b, and c are positive, is a + b > c?

1) [a/c]>b>1

2)ab>ac


Hi,

Stat1:

a/c > b > 1

taking a/c >1 we have
a>c ..(1)
taking b>1 we have
b>1 ...(2)

adding 1 and 2 we have
a + b > c+1 which is obviously > c
=> a + b > c, So, SUFFICIENT

Stat2:
ab > ac
cancel a so we have b > c

since b is > c so if we add any positivie number to b (i.e. a) then the sum will also be greater than c
So, a+ b> C so SUFFICIENT!

Hence Answer is D.

Hope it helps!
_________________

Ankit

Check my Tutoring Site -> Brush My Quant

GMAT Quant Tutor
How to start GMAT preparations?
How to Improve Quant Score?
Gmatclub Topic Tags
Check out my GMAT debrief

How to Solve :
Statistics || Reflection of a line || Remainder Problems || Inequalities

Manager
Manager
avatar
Joined: 25 Jul 2012
Posts: 78
Location: United States
Followers: 0

Kudos [?]: 76 [0], given: 137

Re: If a, b, and c are positive, is a + b > c? [#permalink]

Show Tags

New post 14 Aug 2012, 21:58
Thank you

Sorry I didn't realize this was posted in the PS section
_________________

If my post has contributed to your learning or teaching in any way, feel free to hit the kudos button ^_^

GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 09 Sep 2013
Posts: 11694
Followers: 527

Kudos [?]: 144 [0], given: 0

Premium Member
Re: If a, b, and c are positive, is a + b > c? [#permalink]

Show Tags

New post 14 Nov 2015, 00:11
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: If a, b, and c are positive, is a + b > c?   [#permalink] 14 Nov 2015, 00:11
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Is a + b > c + d ? Bunuel 1 20 Mar 2016, 23:43
2 Experts publish their posts in the topic If a is to b as b is to c, is c positive? Bunuel 3 31 Jan 2016, 08:24
2 Experts publish their posts in the topic If a + b + c > 0, is c > 2? tjerkrintjema 3 10 Jun 2015, 04:04
If a, b, and c are positive, is a>(b+c)/2 kukr007 1 14 Dec 2014, 02:22
9 Experts publish their posts in the topic a, b, and c are positive, is a > b? daviesj 8 14 Dec 2012, 09:28
Display posts from previous: Sort by

If a, b, and c are positive, is a + b > c?

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| 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®.