Find all School-related info fast with the new School-Specific MBA Forum

It is currently 28 Nov 2014, 05:20

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Is the integer z divisible by 6?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 16 Feb 2012
Posts: 259
Concentration: Finance, Economics
Followers: 4

Kudos [?]: 85 [0], given: 121

GMAT ToolKit User
Is the integer z divisible by 6? [#permalink] New post 23 Feb 2012, 14:10
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

72% (01:51) correct 28% (00:50) wrong based on 61 sessions
Is the integer z divisible by 6?

(1) The greatest common factor of z and 12 is 3.
(2) The greatest common factor of z and 15 is 3.


I would appreciate if somebody explains this problem!
[Reveal] Spoiler: OA

_________________

Kudos if you like the post!

Failing to plan is planning to fail.

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 24146
Followers: 3742

Kudos [?]: 31432 [0], given: 3372

Re: Is the integer z divisible by 6? [#permalink] New post 23 Feb 2012, 14:25
Expert's post
Is the integer z divisible by 6?

Realistic GMAT question would mention that z is a positive integer.

(1) The greatest common factor of z and 12 is 3 --> if z were divisible by 6 (for example 6, 12, 18, ...) then the GCF of z and 12 (which is also divisible by 6) would have been more than 3 (6 or 12) and since the GCF is 3 then z is not divisible by 6. Sufficient.

(2) The greatest common factor of z and 15 is 3 --> if z=3 then the answer is NO but if z=6 then the answer is YES. Two different answers, not sufficient.

Answer: A.

Hope it's clear.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Take a Survey about GMAT Prep - Win Prizes!

Re: Is the integer z divisible by 6?   [#permalink] 23 Feb 2012, 14:25
    Similar topics Author Replies Last post
Similar
Topics:
2 Experts publish their posts in the topic Is the integer z divisible by 6? restore 9 08 Aug 2011, 06:56
4 This is what I have: Is the integer z divisible by 6? 1) The Lstadt 6 31 Jul 2011, 13:31
2 Is the integer Z divisible by 6? 1. The GCF of z and 12 is enigma123 14 25 Jun 2011, 11:22
1 Experts publish their posts in the topic Is the integer x divisible by 6? Nihit 5 12 Dec 2008, 02:38
1 Experts publish their posts in the topic Is the integer x divisible by 6? jackychamp 4 14 Feb 2008, 11:37
Display posts from previous: Sort by

Is the integer z divisible by 6?

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.