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GMATPrep - value of n

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California4jx: Master | Next Rank: 500 Posts; Posts: 227; Joined: Thu Aug 14, 2008 10:43 amFollowed by: 1 member; Thanked: 7 times; GMAT Score:650

by California4jx » Mon Nov 24, 2008 11:48 am

Its seems very simple but I couldnt get to the right answer - pls share solution

OA: B

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Source: Beat The GMAT — Problem Solving | Mon Nov 24, 2008 11:48 am

deepamohn: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Sat Dec 29, 2007 8:13 pm; Location: Plano , Texas; Thanked: 2 times

by deepamohn » Tue Nov 25, 2008 8:29 pm

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

n+1=22
n = 21

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