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I know this is easy, but...

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Intern
Intern
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Joined: 09 Dec 2005
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I know this is easy, but... [#permalink] New post 04 Feb 2006, 09:06
Can't figure it out :oops: :
5^21x4^11=2x10^n
n=?

Help!
Director
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Joined: 04 Jan 2006
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 [#permalink] New post 04 Feb 2006, 09:12
==> 5 ^21 * 2 ^ 22 = 2 * 10^n
==> 5 ^ 21 * 2 * 2 ^21 = 2 * 10^n
==> 2* 10 ^ 21 = 2 * 10^n
==> n = 21
  [#permalink] 04 Feb 2006, 09:12
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