NEW HERE? LEARN MORE
closeclose
Last visit was: 24 Apr 2024, 18:07 It is currently 24 Apr 2024, 18:07
Decision Tracker
My Rewards
New posts
New comers' posts

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

If x + y is an integer, is y an integer?

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
User avatar
sset009
Manager
Manager
Joined: 14 Jun 2008
Posts: 113
Own Kudos [?]: 150 [5]
Given Kudos: 0
Send PM
If x + y is an integer, is y an integer? [#permalink] New post   26 Jul 2008, 10:30
1
Kudos
4
Bookmarks
00:00
A
B
C
D
E

Difficulty:

55% (hard)

Question Stats:

55% (01:34) correct 45% (01:54) wrong based on 125 sessions
Hide Show timer Statistics
If x + y is an integer, is y an integer?

(1) x – y is an integer.
(2) x + 2y is an integer.

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-x-y-is-an-integer-is-y-an-integer-128412.html
ShowHide Answer
Official Answer
B
User avatar
sset009
Manager
Manager
Joined: 14 Jun 2008
Posts: 113
Own Kudos [?]: 150 [0]
Given Kudos: 0
Send PM
Re: If x + y is an integer, is y an integer? [#permalink] New post   26 Jul 2008, 10:31
Clearly (1) not suff e.g. x = 1.5, y = 2.5

For 2, i cannot find a counter example,

but can it be proved that x + 2y is sufficient or not sufficient?
avatar
manojrana9
Intern
Intern
Joined: 04 May 2008
Posts: 11
Own Kudos [?]: 3 [2]
Given Kudos: 0
Send PM
Re: If x + y is an integer, is y an integer? [#permalink] New post   26 Jul 2008, 11:56
2
Kudos
Ans- B Alone

If x+y=integer and x+2y=integer, it follows that (x+y)+y=integer which means integer+y=integer
=> y=integer
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92900
Own Kudos [?]: 618816 [2]
Given Kudos: 81588
Send PM
CAT Tests Forum Quiz Mode
If x + y is an integer, is y an integer? [#permalink] New post   05 Dec 2014, 04:22
1
Kudos
1
Bookmarks
Expert Reply
sset009 wrote:
If x + y is an integer, is y an integer?

(1) x – y is an integer.
(2) x + 2y is an integer.



If x + y is an integer, is y an integer?

(1) x – y is an integer --> if x=y=0.5 then the answer to the question is NO but if x=y=1 then the answer to the question is YES. Not sufficient.

(2) x + 2y is an integer --> x+2y=(x+y)+y=integer. Since given that x+y=integer, then: integer+y=integer --> y=integer. Sufficient.

Answer: B.

OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/if-x-y-is-an- ... 28412.html
GMAT Club Bot
gmatclubot
If x + y is an integer, is y an integer? [#permalink]
05 Dec 2014, 04:22
Moderator:
Bunuel
Math Expert
92900 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions