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

It is currently 26 Dec 2014, 02:47

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

Number System!!

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 15 Feb 2011
Posts: 263
Followers: 4

Kudos [?]: 33 [0], given: 9

Number System!! [#permalink] New post 26 Aug 2011, 10:50
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

50% (00:00) correct 50% (00:02) wrong based on 2 sessions
How many integers between 234700 and 458600 have tens digit 1 and units digit 3?

how to solve such questions within 2 min timeframe??
Senior Manager
Senior Manager
avatar
Joined: 15 Feb 2011
Posts: 263
Followers: 4

Kudos [?]: 33 [0], given: 9

Re: Number System!! [#permalink] New post 26 Aug 2011, 11:36
Indeed it is..pls help me with the explanation part..
1 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 03 Mar 2010
Posts: 445
Schools: Kelley,Tepper,Carlson,Kenan Flager,Broad
Followers: 4

Kudos [?]: 127 [1] , given: 22

Re: Number System!! [#permalink] New post 26 Aug 2011, 13:11
1
This post received
KUDOS
DeeptiM wrote:
Indeed it is..pls help me with the explanation part..


Surely.
Take 234700 and 234800. Now how many numbers are there between them? 100.
How many numbers are there between them such that there is 1 at ten's place and 3 at unit's place. 1. 234713.
Take 234700 and 234900.
how many numbers are there between them? 200.
How many numbers are there between them such that there is 1 at ten's place and 3 at unit's place. 2. 234713 and 234813.
Take 234700 and 234500.
how many numbers are there between them? 300.
How many numbers are there between them such that there is 1 at ten's place and 3 at unit's place. 3. 234713, 234813 and 234913.

By now you must have realized the pattern here. For every hundred there is one such number.
Subtract 458600 and 234700
458600-234700=223900
For every hundred 1 such number
So for 223900 there will be 2239 such numbers.

Hope i made it clear.

Also, please include answer options and OA in your question. And yes if this forum/post is helpful to you, show appreciation. ( You know how!)
_________________

My dad once said to me: Son, nothing succeeds like success.

Director
Director
avatar
Joined: 01 Feb 2011
Posts: 766
Followers: 14

Kudos [?]: 63 [0], given: 42

CAT Tests
Re: Number System!! [#permalink] New post 26 Aug 2011, 17:12
-13 appears once in every hundred

458600-234700 = 123900 => 1239 hundreds

so in 1239 hundred's , there are 1239 such numbers with 1 in ten's digit and 3 in units digit.

Answer is 1239.
Director
Director
User avatar
Joined: 03 May 2007
Posts: 894
Schools: University of Chicago, Wharton School
Followers: 6

Kudos [?]: 57 [0], given: 7

Re: Number System!! [#permalink] New post 26 Aug 2011, 17:24
DeeptiM wrote:
How many integers between 234700 and 458600 have tens digit 1 and units digit 3?

how to solve such questions within 2 min timeframe??


The desired numbers have a position of xxx,x13 i.e. every hundred has such a number.

= (458,600 - 234,700)/100
= 223900/100
= 2239

It even does not take more than 20 second.
Manager
Manager
avatar
Joined: 09 Jun 2011
Posts: 105
Followers: 0

Kudos [?]: 17 [0], given: 0

Re: Number System!! [#permalink] New post 01 Sep 2011, 21:16
The desired numbers have a position of xxx,x13 i.e. every hundred has such a number.

= (458,600 - 234,700)/100
= 223900/100
= 2239
For every hundred 1 such number

So for 223900 there will be 2239 such numbers.

I loved this explanation.
Re: Number System!!   [#permalink] 01 Sep 2011, 21:16
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Number systems maheshsrini 5 04 Jan 2012, 16:58
Number System!! DeeptiM 3 18 Aug 2011, 10:47
number system einstein10 3 18 Apr 2010, 23:42
Number system KocharRohit 1 06 Nov 2009, 00:31
Display posts from previous: Sort by

Number System!!

  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®.