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

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How much water should be added to 10 liters of a 20% [#permalink] New post 18 Dec 2007, 08:26
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%?
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Re: easy mixture [#permalink] New post 18 Dec 2007, 13:35
add 40 liters of water.


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%?
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Re: easy mixture [#permalink] New post 18 Dec 2007, 13:47
michaelny2001 wrote:
add 40 liters of water.


I guess not "to add 40" but "to run up to 40" :)
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 [#permalink] New post 18 Dec 2007, 13:50
10*0.2 = (10+X)*0.05

X = 30 and so add 30 Litres of water more.
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Re: easy mixture [#permalink] New post 18 Dec 2007, 14:02
yes you guys are right, add up to 40, not 40. arghhh...


walker wrote:
michaelny2001 wrote:
add 40 liters of water.


I guess not "to add 40" but "to run up to 40" :)
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 [#permalink] New post 18 Dec 2007, 22:03
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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 [#permalink] New post 18 Dec 2007, 22:07
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)
  [#permalink] 18 Dec 2007, 22:07
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