It is currently 21 Nov 2017, 05:36

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

Events & Promotions in June
Open Detailed Calendar

M01-28

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

Hide Tags

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42280

Kudos [?]: 132894 [0], given: 12391

M01-28 [#permalink]

Show Tags

New post 16 Sep 2014, 00:16
Expert's post
5
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

66% (00:46) correct 34% (00:51) wrong based on 190 sessions

HideShow timer Statistics

Kudos [?]: 132894 [0], given: 12391

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42280

Kudos [?]: 132894 [0], given: 12391

Re M01-28 [#permalink]

Show Tags

New post 16 Sep 2014, 00:16
Expert's post
1
This post was
BOOKMARKED
Official Solution:


Statement (1) by itself is not sufficient. 143 is not divisible by every prime number. For example, it is divisible by 11 but not by 2 or 3.

Statement (2) by itself is not sufficient. S2 does not tell us whether z is an integer; and therefore, 143 may or may not be divisible by z.

Statements (1) and (2) combined are sufficient. \(z\) is a prime number between 8 and 17. 11 and 13 are the prime numbers between 8 and 17. These primes are both divisors of 143.


Answer: C
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 132894 [0], given: 12391

Verbal Forum Moderator
avatar
Joined: 15 Apr 2013
Posts: 196

Kudos [?]: 877 [0], given: 30

Location: India
Concentration: General Management, Marketing
GMAT Date: 11-23-2015
GPA: 3.6
WE: Science (Other)
GMAT ToolKit User Premium Member Reviews Badge
Re: M01-28 [#permalink]

Show Tags

New post 07 Aug 2015, 20:19
Hello

Could you please let me know how to derive case of non integer value to denominator that would divide equally with 143?

I was unable to point any?

thanks

Kudos [?]: 877 [0], given: 30

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42280

Kudos [?]: 132894 [0], given: 12391

Re: M01-28 [#permalink]

Show Tags

New post 17 Aug 2015, 03:19

Kudos [?]: 132894 [0], given: 12391

Intern
Intern
avatar
B
Joined: 22 May 2016
Posts: 3

Kudos [?]: [0], given: 27

Reviews Badge
Re: M01-28 [#permalink]

Show Tags

New post 31 Oct 2016, 02:37
Hi,

Why is E not the correct answer? Even if we conclude that 11 and 13 are the values of Z we haven't found a unique value. Isn't this condition insufficient ?

Kudos [?]: [0], given: 27

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42280

Kudos [?]: 132894 [0], given: 12391

Re: M01-28 [#permalink]

Show Tags

New post 31 Oct 2016, 02:39
Saumyos wrote:
Hi,

Why is E not the correct answer? Even if we conclude that 11 and 13 are the values of Z we haven't found a unique value. Isn't this condition insufficient ?


The question asks whether 143/z is an integer, not what is the value of z.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 132894 [0], given: 12391

Intern
Intern
avatar
B
Joined: 06 Sep 2016
Posts: 3

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

GMAT ToolKit User
Re: M01-28 [#permalink]

Show Tags

New post 03 Nov 2016, 04:21
hi
why s1 is not sufficient??
factors of 143 are: 1, 11, 13 and 143, and 11 and 13 are prime numbers which satisfy the s1.
thnks

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

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42280

Kudos [?]: 132894 [0], given: 12391

Re: M01-28 [#permalink]

Show Tags

New post 03 Nov 2016, 04:24
FTR wrote:
hi
why s1 is not sufficient??
factors of 143 are: 1, 11, 13 and 143, and 11 and 13 are prime numbers which satisfy the s1.
thnks


The question asks whether 143/z is an integer. (1) says that z i prime. If z is 11 or 13 then the answer is YES but if z is any other prime, say 2, then the answer is NO.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 132894 [0], given: 12391

Intern
Intern
avatar
Joined: 23 Aug 2017
Posts: 3

Kudos [?]: 0 [0], given: 7

Location: United States (MA)
GMAT 1: 540 Q36 V27
GPA: 3.5
CAT Tests
Re M01-28 [#permalink]

Show Tags

New post 23 Oct 2017, 19:25
I think this is a poor-quality question and I don't agree with the explanation. My confusion in the answer comes from that "Z" can be 11 or 13 for both 1 & 2. One of the values is not canceled out by either of the solutions thus it is not sufficient. Why is C correct?

Kudos [?]: 0 [0], given: 7

Expert Post
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 42280

Kudos [?]: 132894 [0], given: 12391

Re: M01-28 [#permalink]

Show Tags

New post 23 Oct 2017, 21:23
T Adamietz wrote:
I think this is a poor-quality question and I don't agree with the explanation. My confusion in the answer comes from that "Z" can be 11 or 13 for both 1 & 2. One of the values is not canceled out by either of the solutions thus it is not sufficient. Why is C correct?


You should read the question carefully.

The question asks whether 143/z is an integer, not what is the value of z. For both value of z, 143/z IS an integer.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

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?
Extra-hard Quant Tests with Brilliant Analytics

Kudos [?]: 132894 [0], given: 12391

Re: M01-28   [#permalink] 23 Oct 2017, 21:23
Display posts from previous: Sort by

M01-28

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

Moderators: Bunuel, chetan2u



GMAT Club MBA Forum Home| About| Terms and Conditions| 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®.