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How many ounces of pure water must be added to 50 ounces of

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VP
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How many ounces of pure water must be added to 50 ounces of [#permalink] New post 10 Dec 2007, 15:00
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How many ounces of pure water must be added to 50 ounces of a 15% saline solution to make a saline solution that is 10% salt?
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CEO
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Concentration: Entrepreneurship, Other
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 [#permalink] New post 10 Dec 2007, 15:07
Expert's post
25.

c1=m/V
c2=m/(V+∆V)

c2=c1*V/(V+∆V) ==> ∆V=(c1/c2)V-V ==> ∆V=V(c1-c2)/c2

∆V=50*0.05/0.10=25
Director
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 [#permalink] New post 10 Dec 2007, 16:09
well this is how i do..[/img]


btw..whats alligation tech ?
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VP
VP
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Joined: 09 Jul 2007
Posts: 1111
Location: London
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GMAT Tests User
 [#permalink] New post 10 Dec 2007, 16:41
thread teaches you the alligation technique

http://www.gmatclub.com/forum/t36604
  [#permalink] 10 Dec 2007, 16:41
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How many ounces of pure water must be added to 50 ounces of

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