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Exponents question

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rmyoungsc
 Post subject: Exponents question
 Post Posted: Tue Aug 11, 2009 1:58 pm 
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Course Students


Posts: 8
If 5^21 * 4^11 = 2 * 10^n, what is the value of n?

a) 11
b) 21
c) 22
d) 23
e) 32

the answer is b)

I can't figure out how to do this one.

help please!
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Ben Ku
 Post subject: Re: Exponents question
 Post Posted: Tue Aug 18, 2009 9:06 pm 
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ManhattanGMAT Staff


Posts: 823
Hi,

Please see the solution on this post:

http://www.manhattangmat.com/forums/5-21-x-4-11-2-x-10-n-t7549.html

Let me know if you have any additional questions!

_________________
Ben Ku
Instructor
ManhattanGMAT
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