Last visit was: 22 Apr 2026, 07:13 It is currently 22 Apr 2026, 07:13
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
avatar
LukinoF
avatar
Joined: 27 May 2013
Last visit: 11 Dec 2013
Posts: 6
Own Kudos:
1
 [1]
Given Kudos: 6
Posts: 6
Kudos: 1
 [1]
Is a>b? Updated on: 09 Nov 2013, 11:30
Originally posted by LukinoF on 09 Nov 2013, 11:04.
Last edited by Bunuel on 09 Nov 2013, 11:30, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

15% (low)

Question Stats:

77% (00:51) correct 23% (01:04) wrong based on 122 sessions

History

Date
Time
Result
Not Attempted Yet
Is a>b?

(1) a - b > 0
(2) a + b < 0
ShowHide Answer
Official Answer
A
User avatar
mau5
User avatar
Verbal Forum Moderator
Joined: 10 Oct 2012
Last visit: 31 Dec 2024
Posts: 478
Own Kudos:
3,386
 [1]
Given Kudos: 141
Posts: 478
Kudos: 3,386
 [1]
Is a>b? 09 Nov 2013, 11:13
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
LukinoF
Is a>b?

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


Sorry, i do not have OA.

Thank you for your solution.
Show more

F.S 1 states that a>b. Sufficient

F.S 2 states that a<-b. For a=1,b=-2, we have a<-b AND a>b.
However, for a=-1,b=0 we have a<-b AND a<b. Hence,Insufficient.

A.
avatar
LukinoF
avatar
Joined: 27 May 2013
Last visit: 11 Dec 2013
Posts: 6
Own Kudos:
1
Given Kudos: 6
Posts: 6
Kudos: 1
Is a>b? 09 Nov 2013, 11:19
Kudos
Add Kudos
Bookmarks
Bookmark this Post
mau5
LukinoF
Is a>b?

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


Sorry, i do not have OA.

Thank you for your solution.

F.S 1 states that a>b. Sufficient

F.S 2 states that a<-b. For a=1,b=-2, we have a<-b AND a>b.
However, for a=-1,b=0 we have a<-b AND a<b. Hence,Insufficient.

A.
Show more

I think that it should be E.

We do not know whether a and b are positive or negative. Therefore, you cannot add b to (a - b > 0). This will change sign to < if b is negative and vice versa.

Please, correct me if I am not correct.
User avatar
mau5
User avatar
Verbal Forum Moderator
Joined: 10 Oct 2012
Last visit: 31 Dec 2024
Posts: 478
Own Kudos:
3,386
 [1]
Given Kudos: 141
Posts: 478
Kudos: 3,386
 [1]
Is a>b? 09 Nov 2013, 11:22
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
LukinoF

I think that it should be E.

We do not know whether a and b are positive or negative. Therefore, you cannot add b to (a - b > 0). This would change sign to < if b is negative and vice versa.

Please, correct me if I am not correct.
Show more

Nope.

Addition of the SAME quantity has NO effect on the sign of the inequality.

Say, 3>-2, add 10 on both sides : 13>8.

Again, add -10 on both sides, we have : -7>-12.

What you are talking about happens when you multiply an unknown entity(the sign is not known) across an inequality.

Hope this helps.
avatar
LukinoF
avatar
Joined: 27 May 2013
Last visit: 11 Dec 2013
Posts: 6
Own Kudos:
1
Given Kudos: 6
Posts: 6
Kudos: 1
Is a>b? 09 Nov 2013, 11:23
Kudos
Add Kudos
Bookmarks
Bookmark this Post
mau5
LukinoF

I think that it should be E.

We do not know whether a and b are positive or negative. Therefore, you cannot add b to (a - b > 0). This would change sign to < if b is negative and vice versa.

Please, correct me if I am not correct.

Nope.

Addition of the SAME quantity has NO effect on the sign of the inequality.

Say, 3>-2, add 10 on both sides : 13>8.

Again, add -10 on both sides, we have : -7>-12.

What you are talking about happens when you multiply an unknown entity(the sign is not known) across an inequality.

Hope this helps.
Show more

You are right.

Thank you.
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 22 Apr 2026
Posts: 109,743
Own Kudos:
810,577
 [1]
Given Kudos: 105,819
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,743
Kudos: 810,577
 [1]
Is a>b? 09 Nov 2013, 11:32
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Is a>b?

(1) a - b > 0. Add b to both sides: a > b. Sufficient.

(2) a + b < 0. The sum of 2 numbers is greater than 0, from this we cannot say which one is larger. Not sufficient.

Answer: A.
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,962
Own Kudos:
1,117
Posts: 38,962
Kudos: 1,117
Is a>b? 12 Dec 2015, 04:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Bunuel
Math Expert
109743 posts
kingbucky
498 posts
Gmat860sanskar
211 posts