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# How much water should be added to 10 liters of a 20%

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CEO
Joined: 21 Jan 2007
Posts: 2764
Location: New York City
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How much water should be added to 10 liters of a 20% [#permalink]  18 Dec 2007, 07:26
How much water should be added to 10 liters of a 20% solution of alcohol to reduce the concentration of alcohol in the solution by 75%?
Manager
Joined: 02 Feb 2007
Posts: 120
Followers: 1

Kudos [?]: 10 [0], given: 0

Re: easy mixture [#permalink]  18 Dec 2007, 12:35

bmwhype2 wrote:
How much water should be added to 10 liters of a 20% solution of alcohol to reduce the concentration of alcohol in the solution by 75%?
CEO
Joined: 17 Nov 2007
Posts: 3578
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 407

Kudos [?]: 2149 [0], given: 359

Re: easy mixture [#permalink]  18 Dec 2007, 12:47
Expert's post
michaelny2001 wrote:

I guess not "to add 40" but "to run up to 40"
Senior Manager
Joined: 16 Apr 2006
Posts: 280
Followers: 2

Kudos [?]: 46 [0], given: 2

10*0.2 = (10+X)*0.05

X = 30 and so add 30 Litres of water more.
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Trying hard to achieve something unachievable now....

Manager
Joined: 02 Feb 2007
Posts: 120
Followers: 1

Kudos [?]: 10 [0], given: 0

Re: easy mixture [#permalink]  18 Dec 2007, 13:02
yes you guys are right, add up to 40, not 40. arghhh...

walker wrote:
michaelny2001 wrote:

I guess not "to add 40" but "to run up to 40"
SVP
Joined: 28 Dec 2005
Posts: 1583
Followers: 2

Kudos [?]: 88 [0], given: 2

dkverma wrote:
10*0.2 = (10+X)*0.05

X = 30 and so add 30 Litres of water more.

I was trying to go the ratio approach .... can you elaborate on how you came up with the ratio ?
CEO
Joined: 21 Jan 2007
Posts: 2764
Location: New York City
Followers: 9

Kudos [?]: 350 [0], given: 4

pmenon wrote:
dkverma wrote:
10*0.2 = (10+X)*0.05

X = 30 and so add 30 Litres of water more.

I was trying to go the ratio approach .... can you elaborate on how you came up with the ratio ?
Concentration% * Amount = Altered Concentration% * (Amount + Addition)
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