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GMAT Question - From Practice Exam

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Source: — Problem Solving |
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by gmatplayer » Mon May 25, 2009 5:19 pm
The right side is 2 * 10^n

5^21 * 4^11 = 2* (5^n * 2^n)

5^21 * ((2)^2)^11 = 2* (5^n * 2^n)

5^21 * 2^22 = 2* (5^n * 2^n)

Divide each side by 2

5^21 * 2^(22-1) = 5^n * 2^n

5^21 * 2^21 = 5^n * 2^n

So n = 21
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