How much water should be added to 10 liters of a 20% : Quant Question Archive [LOCKED]
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# How much water should be added to 10 liters of a 20%

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CEO
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How much water should be added to 10 liters of a 20% [#permalink]

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18 Dec 2007, 07:26
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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%?
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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
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18 Dec 2007, 12:47
michaelny2001 wrote:

I guess not "to add 40" but "to run up to 40"
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18 Dec 2007, 12:50
10*0.2 = (10+X)*0.05

X = 30 and so add 30 Litres of water more.
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Manager
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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"
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18 Dec 2007, 21:03
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 ?
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18 Dec 2007, 21:07
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)
18 Dec 2007, 21:07
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