GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 16 Oct 2018, 22:23

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.

Close

Request Expert Reply

Confirm Cancel

If x and y are odd integers, which of the following must always be a

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

Hide Tags

Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 49916
If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 19 Aug 2016, 03:18
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

94% (00:37) correct 6% (00:44) wrong based on 228 sessions

HideShow timer Statistics

Intern
Intern
avatar
Joined: 11 Jan 2013
Posts: 5
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 19 Aug 2016, 03:31
Ans) D. as X and Y are odd, multiplication of x and y would result in odd integer
(Odd Integer)/2 will always be non integer
Senior Manager
Senior Manager
User avatar
Joined: 31 Mar 2016
Posts: 390
Location: India
Concentration: Operations, Finance
GMAT 1: 670 Q48 V34
GPA: 3.8
WE: Operations (Commercial Banking)
GMAT ToolKit User Premium Member
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 19 Aug 2016, 04:15
D --> Odd x Odd = Odd integer which never divides evenly (not divisible by an even number) hence D is the right answer
CEO
CEO
User avatar
D
Joined: 12 Sep 2015
Posts: 3000
Location: Canada
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 19 Aug 2016, 05:05
Top Contributor
Bunuel wrote:
If x and y are odd integers, which of the following must always be a non-integer?

A. xy
B. x/y
C. y/x
D. xy/2
E. -xy


Another approach:

The key word is MUST.
So, if we can find an example where the expression evaluates to be an integer, we can ELIMINATE that answer choice.

A) xy: (1)(1) = 1 and 1 is an integer. ELIMINATE
B. x/y: 1/1 = 1 and 1 is an integer. ELIMINATE
C. y/x: 1/1 = 1 and 1 is an integer. ELIMINATE
D. xy/2
E. -xy: -(1)(1) = -1 and -1 is an integer. ELIMINATE

By the process of elimination, the correct answer is

RELATED VIDEO

_________________

Brent Hanneson – GMATPrepNow.com
Image
Sign up for our free Question of the Day emails

Manager
Manager
avatar
S
Joined: 21 Apr 2016
Posts: 178
GMAT ToolKit User Reviews Badge
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 19 Aug 2016, 05:30
Odd*odd = odd

Odd/2 => never an integer!!

Image Posted from GMAT ToolKit
Senior Manager
Senior Manager
User avatar
G
Joined: 06 Jul 2016
Posts: 386
Location: Singapore
Concentration: Strategy, Finance
GMAT ToolKit User Premium Member
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 21 Aug 2016, 10:41
D. As Odd divided by 2 will always be a non-integer. You can substitute xy for numbers and try


Sent from my iPhone using GMAT Club Forum mobile app
_________________

Put in the work, and that dream score is yours!

Current Student
User avatar
D
Joined: 12 Aug 2015
Posts: 2638
Schools: Boston U '20 (M)
GRE 1: Q169 V154
GMAT ToolKit User Premium Member
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 23 Nov 2016, 01:16
Manager
Manager
avatar
S
Joined: 18 Oct 2016
Posts: 139
Location: India
WE: Engineering (Energy and Utilities)
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 13 Apr 2017, 02:50
Option D

x,y are Odd integers. Odd: O, Even: E & Fraction: F

A. xy = O*O = O
B. x/y = O/O = O or F
C. y/x = O/O = O or F
D. xy/2 = O*O/2 = O/2 = F
E. -xy = -O*O = -O = O
_________________

Press Kudos if you liked the post!

Rules for posting - PLEASE READ BEFORE YOU POST

EMPOWERgmat Instructor
User avatar
V
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 12660
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 18 Nov 2017, 16:58
1
Hi All,

We're told that X and Y are ODD integers. We're asked which of the following will always be a NON-INTEGER. This question can be solved by TESTing VALUES.

IF... X=3 and Y=3
Answer A: 9
Answer B: 1
Answer C: 1
Answer D: 9/2
Answer E: -9

Final Answer:

GMAT assassins aren't born, they're made,
Rich
_________________

760+: Learn What GMAT Assassins Do to Score at the Highest Levels
Contact Rich at: Rich.C@empowergmat.com

Rich Cohen

Co-Founder & GMAT Assassin

Special Offer: Save $75 + GMAT Club Tests Free
  Official GMAT Exam Packs + 70 Pt. Improvement Guarantee
www.empowergmat.com/

*****Select EMPOWERgmat Courses now include ALL 6 Official GMAC CATs!*****

Target Test Prep Representative
User avatar
G
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2830
Re: If x and y are odd integers, which of the following must always be a  [#permalink]

Show Tags

New post 22 Nov 2017, 13:22
Bunuel wrote:
If x and y are odd integers, which of the following must always be a non-integer?

A. xy
B. x/y
C. y/x
D. xy/2
E. -xy


Since odd x odd = odd and an odd number is never divisible by 2, xy/2 will always be a non-integer.

Answer: D
_________________

Jeffery Miller
Head of GMAT Instruction

GMAT Quant Self-Study Course
500+ lessons 3000+ practice problems 800+ HD solutions

GMAT Club Bot
Re: If x and y are odd integers, which of the following must always be a &nbs [#permalink] 22 Nov 2017, 13:22
Display posts from previous: Sort by

If x and y are odd integers, which of the following must always be a

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

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®.