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

It is currently 01 Aug 2015, 20:42
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

OK, first post but (as all say) I have been reading for a

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
VP
VP
avatar
Joined: 11 Dec 2006
Posts: 1430
Location: New York, NY
Schools: NYU Stern 2009
Followers: 40

Kudos [?]: 219 [0], given: 6

OK, first post but (as all say) I have been reading for a [#permalink] New post 07 Jan 2007, 14:01
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

OK, first post but (as all say) I have been reading for a while and it has been a valuable resource. Well, also slightly intimidating, as everyone seems to have committed a lot more prep time to the GMAT than I could manage.

Anyway, I have the test tomorrow, and on the practice test only got one question that I cannot resolve. It was the first one, I got it wrong, and I can't work out the underlying process to get the answer (all the others made fair sense).

Anyway

5^21 * 4^11 = 2 * 10^n

Find n. The answers available don't really matter, I would just really appreciate a full solution so I can see what rules I am missing.
Kaplan GMAT Prep Discount CodesKnewton GMAT Discount CodesGMAT Pill GMAT Discount Codes
Senior Manager
Senior Manager
User avatar
Joined: 08 Aug 2006
Posts: 346
Location: San Francisco
Schools: Berkeley Haas
Followers: 4

Kudos [?]: 12 [0], given: 0

 [#permalink] New post 07 Jan 2007, 14:13
4^11 = (2^2)^11 = 2^22 = 2 * 2^21

5^21 * 2 * 2^21 = 2 * (5 * 2)^21 = 2 * 10^21

n = 21

peanuts ;)
VP
VP
avatar
Joined: 11 Dec 2006
Posts: 1430
Location: New York, NY
Schools: NYU Stern 2009
Followers: 40

Kudos [?]: 219 [0], given: 6

 [#permalink] New post 07 Jan 2007, 14:34
Thank you very much. I remember being poor at deconstructing exponentials about 12 years ago as well!

Makes good sense now - I will go back to swotting on my exponential rules.
Director
Director
User avatar
Joined: 26 Feb 2006
Posts: 905
Followers: 4

Kudos [?]: 64 [0], given: 0

 [#permalink] New post 07 Jan 2007, 16:51
braindancer wrote:
Never argue with an idiot. They drag you down to their level, then beat you with experience.


Very touchy. I like it.

But should not it be like this "Never argue with idiots. They drag you down to their level, then beat you with their experience."?
Senior Manager
Senior Manager
User avatar
Joined: 08 Aug 2006
Posts: 346
Location: San Francisco
Schools: Berkeley Haas
Followers: 4

Kudos [?]: 12 [0], given: 0

 [#permalink] New post 08 Jan 2007, 01:53
Well yes, I think you're right, but it's a quote so I left it that way :)

Don't overGMAT on everything - sometimes sentence correction is not really necessary :lol:
Manager
Manager
User avatar
Joined: 01 Dec 2006
Posts: 58
Followers: 1

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

 [#permalink] New post 10 Jan 2007, 08:10
5^21*2^22=2*2^n*5^n
5^21*2^22=2^(n+1)5^n
n+1=22 n=21
  [#permalink] 10 Jan 2007, 08:10
Display posts from previous: Sort by

OK, first post but (as all say) I have been reading for a

  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®.