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# Does anyone have a link where I can learn the theory to

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Manager
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Does anyone have a link where I can learn the theory to [#permalink]  05 Aug 2006, 13:01
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Does anyone have a link where I can learn the theory to solve these problems? I have never seen something like this before
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Manager
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CHEN wrote:
5^21 * 4^11 = 5^21 * 2^22 = 10^21 * 2

I am slightly confused I see how we got 2^22 on the left side.
Why does 10^21*2 = what is on the left hand side?
Manager
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5^21 * 2^22 = ( 5^21*2^21 )*2
= (10*21) *2
Manager
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Re: Help Numb Prop PS from GMAT Prep [#permalink]  05 Aug 2006, 14:13
jamesrwright3 wrote:
Does anyone have a link where I can learn the theory to solve these problems? I have never seen something like this before

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

Hence comparing exponents of Left hand side and righ hand side

n=21
Re: Help Numb Prop PS from GMAT Prep   [#permalink] 05 Aug 2006, 14:13
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