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by adthedaddy » Thu Aug 30, 2012 10:56 pm
(v*)* = (v-v/3)-[(v-v/3)/3] = (2v/3) - (2v/9) = 4v/9
Now given that (v*)* = 8
4v/9 = 8
Therefore, v=18
Option: B
"Your time is limited, so don't waste it living someone else's life. Don't be trapped by dogma - which is living with the results of other people's thinking. Don't let the noise of others' opinions drown out your own inner voice. And most important, have the courage to follow your heart and intuition. They somehow already know what you truly want to become. Everything else is secondary" - Steve Jobs
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by atul1729 » Thu Aug 30, 2012 10:56 pm
as v*=v-v/3
(v*)*=v*-v*/3 = v-v/3-{(v-v/3)/3}=8
=>v-v/3-v/3+v/9=8
=>(10v-6v)/9=8
=>v=18

ans option B
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by Brent@GMATPrepNow » Fri Aug 31, 2012 5:08 am
The two above solutions are perfect, but I thought I'd point out that plugging in the answer choices might be a fast approach as well.

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by mohan514 » Fri Aug 31, 2012 9:14 am
made a calculation mistake here....

3v-v if not substituted with 2v is giving me an error

m not sure where i am making the mistake
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