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

It is currently 17 Sep 2014, 12:07

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

Qn 266. If the two-digit integers M and N are positive and

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 28 Apr 2003
Posts: 95
Location: Singapore
Followers: 1

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

Qn 266. If the two-digit integers M and N are positive and [#permalink] New post 20 Jan 2004, 06:35
Qn 266.

If the two-digit integers M and N are positive and have the same digits, but in reverse order, which of the following CANNOT be the sum of M and N?

a. 181
b. 165
c. 121
d. 99
e. 44

The answer is 181, and can anyone show a standard working in deriving the answer?
Intern
Intern
avatar
Joined: 20 Jan 2004
Posts: 19
Location: KZ
Followers: 0

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

 [#permalink] New post 20 Jan 2004, 07:25
The crack technique is the following:
1) M is A tens plus B units, then M=10*A+B;
2) N is B tens plus A units, then N=10*B+A;
3) M+N=(10*A+B)+(10*B+A)=11*A+11*B=11*(A+B)
4) so the sum of M and N must be divisible by 11.

How to reveal the right answer since now is easy, isn't it?

The all answers except for 181 are divisible by 11.

That's the point.
Manager
Manager
User avatar
Joined: 26 Dec 2003
Posts: 227
Location: India
Followers: 1

Kudos [?]: 2 [0], given: 0

GMAT Tests User
 [#permalink] New post 20 Jan 2004, 13:17
I checked each and every answer choices, I guess its much easier. 165=87+78, 121=74+47, 99=45+54 and 44=22+22
  [#permalink] 20 Jan 2004, 13:17
    Similar topics Author Replies Last post
Similar
Topics:
2 If the two-digit integers M and N are positive and have the melissawlim 4 12 Dec 2009, 08:04
If the two-digit integers M and N are positive and have the rao 3 31 Aug 2008, 09:53
If the two-digit integers M and N are positive and have the Ravshonbek 3 02 Oct 2007, 11:43
If the two-digit integers M and N are positive and have the crazy123 4 07 Aug 2007, 21:48
If the two-digit integers M and N are positive and have the wendy1 4 20 May 2007, 03:20
Display posts from previous: Sort by

Qn 266. If the two-digit integers M and N are positive and

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.