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

It is currently 02 Sep 2015, 00:41
GMAT Club Tests

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 5^2^1 X 4^1^1 = 2 X 10^n what is the value of n?

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 09 Jan 2009
Posts: 7
Followers: 0

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

If 5^2^1 X 4^1^1 = 2 X 10^n what is the value of n? [#permalink] New post 09 Jan 2009, 08:40
1
This post was
BOOKMARKED
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If \(5^2^1 X 4^1^1 = 2 X 10^n\) what is the value of n?

o 11
o 21
o 22
o 23
o 32

Hi, has someone a quick way of getting this done?

Answer A is correct (not E as indicated).

many Thx
Attachments

Picture 9.png
Picture 9.png [ 10.33 KiB | Viewed 1370 times ]

Manager
Manager
avatar
Joined: 04 Jan 2009
Posts: 241
Followers: 1

Kudos [?]: 10 [0], given: 0

Re: GMAT Prep - Exponent Problem [#permalink] New post 09 Jan 2009, 08:48
I may be wrong; now I get B.

5^21x4^11 = 5^21x2^21x2=2x(5x2)^21
_________________

-----------------------
tusharvk

Intern
Intern
avatar
Joined: 09 Jan 2009
Posts: 7
Followers: 0

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

Re: GMAT Prep - Exponent Problem [#permalink] New post 09 Jan 2009, 08:57
sorry it is B :oops:
Intern
Intern
avatar
Joined: 09 Jan 2009
Posts: 7
Followers: 0

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

Re: GMAT Prep - Exponent Problem [#permalink] New post 09 Jan 2009, 09:06
thanks so far....but can you expalain your step from
4^11 to 2^21x2 ?

many thanks
Manager
Manager
avatar
Joined: 04 Jan 2009
Posts: 241
Followers: 1

Kudos [?]: 10 [0], given: 0

Re: GMAT Prep - Exponent Problem [#permalink] New post 09 Jan 2009, 10:24
Oh I apologize; in my excitement I just jumped off.
5^21x4^11 = 5^21x(2^2)^11 = 5^21x2^22 = 2x2^21x5^21=2x(5x2)^21=2x10^21.

best.
_________________

-----------------------
tusharvk

1 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 02 Nov 2008
Posts: 283
Followers: 1

Kudos [?]: 52 [1] , given: 2

Re: GMAT Prep - Exponent Problem [#permalink] New post 09 Jan 2009, 12:46
1
This post received
KUDOS
tusharvk wrote:
Oh I apologize; in my excitement I just jumped off.
5^21x4^11 = 5^21x(2^2)^11 = 5^21x2^22 = 2x2^21x5^21=2x(5x2)^21=2x10^21.

best.


2 = 2^1
10^N = 2^N X 5^N

2 X 10^N = 2^(N+1) X 5^N

4^11 = 2^11 X 2^11
SO:
5^21 X 2^22 = 2^(N+1) X 5^N

Drop the bases and the answer is clearly 21.
Manager
Manager
avatar
Joined: 01 Nov 2008
Posts: 127
Followers: 1

Kudos [?]: 4 [0], given: 0

Re: GMAT Prep - Exponent Problem [#permalink] New post 15 Jan 2009, 03:49
Yeah the Answer is B
Re: GMAT Prep - Exponent Problem   [#permalink] 15 Jan 2009, 03:49
Display posts from previous: Sort by

If 5^2^1 X 4^1^1 = 2 X 10^n what is the value 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®.