Last visit was: 15 Dec 2024, 11:03 It is currently 15 Dec 2024, 11:03
Home
GMAT
Messages
Tests
Schools
Reviews
Social
Chat
My Profile
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
hitmoss
avatar
Joined: 05 Sep 2009
Last visit: 17 Jul 2015
Posts: 5
Own Kudos:
15
 []
Given Kudos: 4
Posts: 5
Kudos: 15
 []
Is x + y negative? (1) x is positive. (2) y is negative. 15 May 2011, 06:42
2
Kudos
Add Kudos
2
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

89% (00:30) correct 11% (00:22) wrong based on 269 sessions

History

Date
Time
Result
Not Attempted Yet
Is x + y negative?

(1) x is positive.

(2) y is negative.
ShowHide Answer
Official Answer
E
avatar
ulm
avatar
Joined: 03 Jun 2010
Last visit: 20 Aug 2019
Posts: 97
Own Kudos:
550
 []
Given Kudos: 40
Location: United States (MI)
Concentration: Marketing, General Management
Schools: Ross '15 (A) Darden '14 (D) Duke '15 (D)
WE:Business Development (Consumer Packaged Goods)
Products:
My Reviews
Schools: Ross '15 (A) Darden '14 (D) Duke '15 (D)
Posts: 97
Kudos: 550
 []
Is x + y negative? (1) x is positive. (2) y is negative. 15 May 2011, 06:52
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
hitmoss
Is X + Y Negative?

i) X is Positive.
ii) Y is Negative.


It's just a easy question, and I got wrong. (My Bad!)

1) and 2) clearly insufficient.
1)+2) still ins.
Consider,
\(x=10, y=-3, -> x+y=7>0\)
\(x=10, y=-35, -> x+y=-25<0\)

2 different answers.
(E)
User avatar
amit2k9
User avatar
Joined: 08 May 2009
Last visit: 18 Jun 2017
Posts: 540
Own Kudos:
602
Given Kudos: 10
Status:There is always something new !!
Affiliations: PMI,QAI Global,eXampleCG
Posts: 540
Kudos: 602
Is x + y negative? (1) x is positive. (2) y is negative. 18 May 2011, 21:57
Kudos
Add Kudos
Bookmarks
Bookmark this Post
no relative information between X and Y.
E
User avatar
subhashghosh
User avatar
Retired Moderator
Joined: 16 Nov 2010
Last visit: 25 Jun 2024
Posts: 903
Own Kudos:
1,219
Given Kudos: 43
Location: United States (IN)
Concentration: Strategy, Technology
Products:
My Reviews
Posts: 903
Kudos: 1,219
Is x + y negative? (1) x is positive. (2) y is negative. 19 May 2011, 05:24
Kudos
Add Kudos
Bookmarks
Bookmark this Post
X = 1, Y = +2

X = 2 Y = -1

Answer - E
User avatar
bellcurve
User avatar
Joined: 19 Nov 2010
Last visit: 19 Mar 2014
Posts: 63
Own Kudos:
258
Given Kudos: 9
Posts: 63
Kudos: 258
Is x + y negative? (1) x is positive. (2) y is negative. 19 May 2011, 13:06
Kudos
Add Kudos
Bookmarks
Bookmark this Post
x+y<0 if both x & Y are - or x is - and y is + with |x|>|y| or x is + and y is - with |y| > |x|.

Even with the combinaion, since we only know the sign not the magnitude, it is insuff.
User avatar
Spidy001
User avatar
Joined: 01 Feb 2011
Last visit: 16 Feb 2015
Posts: 302
Own Kudos:
334
Given Kudos: 42
Posts: 302
Kudos: 334
Is x + y negative? (1) x is positive. (2) y is negative. 19 May 2011, 15:47
Kudos
Add Kudos
Bookmarks
Bookmark this Post
1. Not sufficient

x>0
if y>0 then x+y is not less than 0
if y<0 x+y may or may not be less than 0

2. Not sufficient

y<0
if x<0 then x+y<0
if x>0 x+y may or may not be less than 0


together
x>0 y<0

x y
1 -1 => x+y is not less than 0

1 -2 =>x+y <0

Hence not sufficient.

Answer is E.
User avatar
BrentGMATPrepNow
User avatar
GMAT Club Legend
Joined: 12 Sep 2015
Last visit: 13 May 2024
Posts: 6,786
Own Kudos:
32,218
 []
Given Kudos: 799
Location: Canada
Expert reply
Posts: 6,786
Kudos: 32,218
 []
Is x + y negative? (1) x is positive. (2) y is negative. 30 Mar 2018, 10:09
2
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
hitmoss
Is x + y negative?

(1) x is positive.

(2) y is negative.

Target question: Is x + y negative?

Statement 1: x is positive
Since we have no information about y, there's no way to determine whether x + y is negative.
Since we cannot answer the target question with certainty, statement 1 is NOT SUFFICIENT

Statement 2: y is negative
Since we have no information about x, there's no way to determine whether x + y is negative.
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT

Statements 1 and 2 combined
There are several values of x and y that satisfy BOTH statements. Here are two:
Case a: x = 1 and y = -3. In this case, x + y = 1 + (-3) = -2. So, the answer to the target question is YES, x+y IS negative
Case b: x = 2 and y = -1. In this case, x + y = 2 + (-1) = 1. So, the answer to the target question is NO, x+y is NOT negative
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

Answer: E

Cheers,
Brent
User avatar
AritraKundu
User avatar
Joined: 05 Feb 2017
Last visit: 23 Jul 2023
Posts: 15
Own Kudos:
9
Given Kudos: 80
Posts: 15
Kudos: 9
Is x + y negative? (1) x is positive. (2) y is negative. 22 May 2022, 20:19
Kudos
Add Kudos
Bookmarks
Bookmark this Post
To make x+y<0
We have to prove 3 things together
1. The sign of x
2. The sign of y
2. Check if x<-y

From statement 1, we only know the sign of x
From statement 2, we only know the sign of y
From both 1 and 2, we know sign of both x and y. Still we dont know whether x<-y

Go with concepts. It will take much lesser time
Moderator:
Bunuel
Math Expert
97885 posts