How many ounces of pure water must be added to 50 ounces of : PS Archive
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# How many ounces of pure water must be added to 50 ounces of

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VP
Joined: 09 Jul 2007
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Location: London
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How many ounces of pure water must be added to 50 ounces of [#permalink]

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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?
CEO
Joined: 17 Nov 2007
Posts: 3589
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 548

Kudos [?]: 3559 [0], given: 360

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10 Dec 2007, 15:07
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
Joined: 08 Jun 2007
Posts: 583
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10 Dec 2007, 16:09
well this is how i do..[/img]

btw..whats alligation tech ?
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sol.jpg [ 10.71 KiB | Viewed 896 times ]

VP
Joined: 09 Jul 2007
Posts: 1104
Location: London
Followers: 6

Kudos [?]: 103 [0], given: 0

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10 Dec 2007, 16:41
thread teaches you the alligation technique

http://www.gmatclub.com/forum/t36604
10 Dec 2007, 16:41
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