Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
May 1212:00 PM EDT
-11:59 PM EDT
Make the most of your break with the most realistic GMAT™ prep. Take up to $700 off select products.
May 1308:30 AM PDT
-09:30 AM PDT
In Episode 4 of our GMAT Ninja CR series, we tackle the most intimidating CR question type: Boldface & "Legalese" questions. If you've ever stared at an answer choice that reads, "The first is a consideration introduced to counter a position that...- May 14
08:30 AM PDT
-09:30 AM PDT
Most GMAT test-takers are intimidated by the hardest GMAT Verbal questions. In this session, Target Test Prep GMAT instructor Erika Tyler-John, a 100th percentile GMAT scorer, will show you how top scorers break down challenging Verbal questions..
09 Oct 2005, 21:37
Kudos
Bookmarks
Hi,
A while back on dowloaded GMAT Prep tests that someone linked in one of these forums directly from the mba.com website. I took the first test, however it doesn't have answer explanations. Does anyone know where I can get these or can I just start posting the questions here and wait for people to solve them? I don't want to duplicate if they are already posted somewhere.
here's one I guessed right on but don't know how to figure it out:
5^21 * 4^11 = 2 * 10^n
what's the value of n?
a. 11
b. 21
c. 22
d. 23
e. 32
Can you explain how you would solve this?
Thanks!
A while back on dowloaded GMAT Prep tests that someone linked in one of these forums directly from the mba.com website. I took the first test, however it doesn't have answer explanations. Does anyone know where I can get these or can I just start posting the questions here and wait for people to solve them? I don't want to duplicate if they are already posted somewhere.
here's one I guessed right on but don't know how to figure it out:
5^21 * 4^11 = 2 * 10^n
what's the value of n?
a. 11
b. 21
c. 22
d. 23
e. 32
Can you explain how you would solve this?
Thanks!
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
09 Oct 2005, 21:45
Kudos
Bookmarks
5^21*4^11=2*10^n
5^21*2^22=2*2^n*5^n (4^11=2^(2*11) and 10^n = (5*2)^n=5^n*2^n
5^21*2^22=2^(n+1)*5^n (2*2^n = 2^(n+1)
n=21
alternatively,
LHS = 5^21*4^11=5^21*2^22 = (5*2)^21*2
so we get 2*10^21=2*10^n
n = 21
5^21*2^22=2*2^n*5^n (4^11=2^(2*11) and 10^n = (5*2)^n=5^n*2^n
5^21*2^22=2^(n+1)*5^n (2*2^n = 2^(n+1)
n=21
alternatively,
LHS = 5^21*4^11=5^21*2^22 = (5*2)^21*2
so we get 2*10^21=2*10^n
n = 21
09 Oct 2005, 21:51
Kudos
Bookmarks
B) 21
5^21*4^11 = 2*10^n
5^21*2^22 = 2*2^n*5^n
5^21*2^22 = 2^(n+1)*5^n
For LHS = RHS to hold true,
n=21 (powers of 5 or use powers of 2 => n+1=22 or n=21 again)
5^21*4^11 = 2*10^n
5^21*2^22 = 2*2^n*5^n
5^21*2^22 = 2^(n+1)*5^n
For LHS = RHS to hold true,
n=21 (powers of 5 or use powers of 2 => n+1=22 or n=21 again)
