GMAT Prep Question Exponents

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hurkflava: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Thu Aug 28, 2008 10:29 am

by hurkflava » Mon May 18, 2009 6:31 pm

This is my first post.
I know this is so easy. However, I do not know what the heck to do with this.

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

What is the value of n?

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

Can someone please clue me in
Thanks
Dre

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Source: Beat The GMAT — Problem Solving | Mon May 18, 2009 6:31 pm

ssmiles08: Master | Next Rank: 500 Posts; Posts: 472; Joined: Sun Mar 29, 2009 6:54 pm; Thanked: 56 times

by ssmiles08 » Mon May 18, 2009 7:05 pm

(4)^11 = (2^2)^11 = 2^22

5^21 * 2^21 *2

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

n= 21

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hurkflava: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Thu Aug 28, 2008 10:29 am

by hurkflava » Tue May 19, 2009 5:19 am

Thank you so much

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