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

It is currently 13 Dec 2018, 16:48

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
Events & Promotions in December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
  • GMATbuster's Weekly GMAT Quant Quiz, Tomorrow, Saturday at 9 AM PST

     December 14, 2018

     December 14, 2018

     09:00 AM PST

     10:00 AM PST

    10 Questions will be posted on the forum and we will post a reply in this Topic with a link to each question. There are prizes for the winners.
  • The winning strategy for 700+ on the GMAT

     December 13, 2018

     December 13, 2018

     08:00 AM PST

     09:00 AM PST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.

If 15 and 4 are factors of positive integer K, and 5 and 8 are not

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

Hide Tags

CEO
CEO
User avatar
D
Joined: 11 Sep 2015
Posts: 3237
Location: Canada
If 15 and 4 are factors of positive integer K, and 5 and 8 are not  [#permalink]

Show Tags

New post 18 May 2017, 06:00
1
Top Contributor
7
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

63% (02:05) correct 37% (02:02) wrong based on 140 sessions

HideShow timer Statistics

If 15 and 4 are factors of positive integer K, and 5 and 8 are not factors of positive integer M, then K – M CANNOT equal

A) 34
B) 44
C) 54
D) 70
E) 83

*kudos for all correct solutions

_________________

Test confidently with gmatprepnow.com
Image

Most Helpful Expert Reply
CEO
CEO
User avatar
P
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2711
Location: India
GMAT: INSIGHT
WE: Education (Education)
Reviews Badge
Re: If 15 and 4 are factors of positive integer K, and 5 and 8 are not  [#permalink]

Show Tags

New post 18 May 2017, 06:59
6
1
GMATPrepNow wrote:
If 15 and 4 are factors of positive integer K, and 5 and 8 are not factors of positive integer M, then K – M CANNOT equal

A) 34
B) 44
C) 54
D) 70
E) 83

*kudos for all correct solutions


k is a multiple of 5 and M is NOT a multiple of 5

hence K-M can never be a multiple of 5

Answer: Option D
_________________

Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION

General Discussion
CEO
CEO
User avatar
D
Joined: 11 Sep 2015
Posts: 3237
Location: Canada
Re: If 15 and 4 are factors of positive integer K, and 5 and 8 are not  [#permalink]

Show Tags

New post 26 May 2017, 13:36
Top Contributor
3
GMATPrepNow wrote:
If 15 and 4 are factors of positive integer K, and 5 and 8 are not factors of positive integer M, then K – M CANNOT equal

A) 34
B) 44
C) 54
D) 70
E) 83


RULE #1: If d is a divisor/factor of x, but d is NOT a divisor/factor of y, then d is NOT a divisor/factor of x+y
RULE #2: If d is a divisor/factor of x, but d is NOT a divisor/factor of y, then d is NOT a divisor/factor of x-y


If 15 is a factor of K, then we can also be certain that 5 is a factor of K.
So, we know that 5 is a factor of K AND we know that 5 is not a factor of M
By RULE #2, we know that 5 is not a factor of K - M
So, K-M cannot equal 70

Answer:

RELATED VIDEO

_________________

Test confidently with gmatprepnow.com
Image

VP
VP
avatar
P
Joined: 07 Dec 2014
Posts: 1128
If 15 and 4 are factors of positive integer K, and 5 and 8 are not  [#permalink]

Show Tags

New post 24 Aug 2018, 17:19
GMATPrepNow wrote:
If 15 and 4 are factors of positive integer K, and 5 and 8 are not factors of positive integer M, then K – M CANNOT equal

A) 34
B) 44
C) 54
D) 70
E) 83

*kudos for all correct solutions


picking a number,
if K=120,
then K-M cannot equal 120-50=70,
as 50 is a multiple of 5
D
GMAT Club Bot
If 15 and 4 are factors of positive integer K, and 5 and 8 are not &nbs [#permalink] 24 Aug 2018, 17:19
Display posts from previous: Sort by

If 15 and 4 are factors of positive integer K, and 5 and 8 are not

  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®.