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GMATprep (chemical reaction)

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GMATprep (chemical reaction) [#permalink] New post 27 Apr 2007, 06:29
Plz explain how to solve this
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Re: GMATprep (chemical reaction) [#permalink] New post 27 Apr 2007, 08:18
cr = x a^2 (1/b) where x is a constant

since new cr = old cr

x (y^2) (1/2b) = x a^2 (1/b)
(y^2) (1/2) = a^2
y^2 = 2 a^2
y = sqrt(2) a
y = 1.4 a
so a has to increase by 40%.
Re: GMATprep (chemical reaction)   [#permalink] 27 Apr 2007, 08:18
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