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

It is currently 16 Sep 2014, 13:52

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

If n is a positive integer, what is the tens digit of n ?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
User avatar
Status: GMAT Learner
Joined: 14 Jul 2010
Posts: 652
Followers: 34

Kudos [?]: 230 [0], given: 32

GMAT Tests User
If n is a positive integer, what is the tens digit of n ? [#permalink] New post 25 Feb 2011, 04:12
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

59% (01:40) correct 41% (01:13) wrong based on 39 sessions
If n is a positive integer, what is the tens digit of n ?

(1) The hundreds digit of 10n is 6.
(2) The tens digit of n + 1 is 7.

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-n-is-a-positive-integer-what-is-the-tens-digit-of-n-144725.html
[Reveal] Spoiler: OA

_________________

I am student of everyone-baten
Collections:-
PSof OG solved by GC members: http://gmatclub.com/forum/collection-ps-with-solution-from-gmatclub-110005.html
DS of OG solved by GC members: http://gmatclub.com/forum/collection-ds-with-solution-from-gmatclub-110004.html
100 GMAT PREP Quantitative collection http://gmatclub.com/forum/gmat-prep-problem-collections-114358.html
Collections of work/rate problems with solutions http://gmatclub.com/forum/collections-of-work-rate-problem-with-solutions-118919.html
Mixture problems in a file with best solutions: http://gmatclub.com/forum/mixture-problems-with-best-and-easy-solutions-all-together-124644.html

Kaplan GMAT Prep Discount CodesKnewton GMAT Discount CodesManhattan GMAT Discount Codes
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 2047
Followers: 128

Kudos [?]: 920 [0], given: 376

GMAT Tests User
Re: og ds 167 [#permalink] New post 25 Feb 2011, 04:29
If n is a positive integer, what is the tens digit of n ?

(1) The hundreds digit of 10n is 6.
Multiplication by 10 will shift all digits one to the left. Ten's digit of n must be 6.

e.g.
n=4324324242468<- 6 in tens place
10n=43243242424680<-hundred's digit in 6 because 0 occupied the units place and rest all of digits moved 1 to the left.

n=69<-6 in tens place
10n=690<-6 in hundreds place

Sufficient.


(2) The tens digit of n + 1 is 7.
n=69
n+1=70<-tens digit of n+1 is 7 when tens place of n=6

n=73
n+1=74<-tens digit of n+1 is 7 when tens place of n=7

Not Sufficient.

Ans: "A"
_________________

~fluke

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
User avatar
Joined: 17 Feb 2011
Posts: 201
Concentration: Real Estate, Finance
Schools: MIT (Sloan) - Class of 2014
GMAT 1: 760 Q50 V44
Followers: 33

Kudos [?]: 492 [0], given: 70

Re: og ds 167 [#permalink] New post 25 Feb 2011, 05:32
It is easy to see that the information provided is enough to solve the problem. I think the main trick is that some may think A is not enough. Dividing any 6xx number by 10 wil yield 6 as a tens digit, so this is sufficient to solve the question.
Intern
Intern
avatar
Joined: 05 Jun 2013
Posts: 4
Followers: 0

Kudos [?]: 0 [0], given: 9

Re: og ds 167 [#permalink] New post 16 Aug 2013, 02:29
miguelmick wrote:
It is easy to see that the information provided is enough to solve the problem. I think the main trick is that some may think A is not enough. Dividing any 6xx number by 10 wil yield 6 as a tens digit, so this is sufficient to solve the question.


I'd rather say that the prompt sounds a little tricky.

tens digit of n + 1 (as in a tens digit format)
-> ex. n= 6(X) + 10 (+1 ten digit format)
No matter which unit digit it is, the tens digit of n must always be 6.. anyways OGs intended meaning is clear now
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 29654
Followers: 3489

Kudos [?]: 26220 [0], given: 2707

Re: If n is a positive integer, what is the tens digit of n ? [#permalink] New post 16 Aug 2013, 03:57
Expert's post
If n is a positive integer, what is the tens digit of n ?

(1) The hundreds digit of 10n is 6. This implies that the tens digit of n is 6. Sufficient.

(2) The tens digit of n + 1 is 7. If n=70, then the tens digit of n is 7, but if n=69, then the tens digit of n is 6. Not sufficient.

Answer: A.

OPEN DISCUSSION OF THIS QUESTION IS HERE: if-n-is-a-positive-integer-what-is-the-tens-digit-of-n-144725.html
_________________

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

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: If n is a positive integer, what is the tens digit of n ?   [#permalink] 16 Aug 2013, 03:57
    Similar topics Author Replies Last post
Similar
Topics:
1 If n is a positive integer, what is the tens digit of n ? sehosayho 1 26 May 2014, 20:12
1 Experts publish their posts in the topic If n is a four-digit positive integer, then what is the tens fozzzy 5 15 Jun 2013, 07:02
10 Experts publish their posts in the topic If n is a positive integer, what is the tens digit of n ? Walkabout 4 26 Dec 2012, 04:51
3 If n is a positive integer, what is the tens digit of n ? siddhans 8 10 Jun 2011, 23:47
Experts publish their posts in the topic If n is a positive integer, what is the tens digit of n ? mbassmbass04 4 18 Dec 2004, 16:39
Display posts from previous: Sort by

If n is a positive integer, what is the tens digit of n ?

  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®.