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John has 20 ounces of a 20% of salt solution. How much salt

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Director
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John has 20 ounces of a 20% of salt solution. How much salt [#permalink] New post 10 Oct 2006, 07:03
John has 20 ounces of a 20% of salt solution. How much salt should he add to make it a 25% solution?
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 [#permalink] New post 10 Oct 2006, 07:22
Add a ounces more of salt, we got
(a+4)/(20+a)=1/4 => a=4/3
So 4/3 ounces more of salt pliz!
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 [#permalink] New post 10 Oct 2006, 08:14
quangviet512 wrote:
Add a ounces more of salt, we got
(a+4)/(20+a)=1/4 => a=4/3
So 4/3 ounces more of salt pliz!


I have a doubt: is the volume supposed to increase or is it constant? If I had not seen your work, I'd have assumed that volume would remain at 20ounces.
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 [#permalink] New post 10 Oct 2006, 08:53
Obviously the volume will increase.
It must be 4/3 ounces.

Look the following thread........
I have explained a technique called alligation so that questions on mixtures like these can be answered fast...........

http://www.gmatclub.com/phpbb/viewtopic ... 676#251676
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 [#permalink] New post 12 Oct 2006, 05:38
cicerone wrote:
Obviously the volume will increase.
It must be 4/3 ounces.

Look the following thread........
I have explained a technique called alligation so that questions on mixtures like these can be answered fast...........

http://www.gmatclub.com/phpbb/viewtopic ... 676#251676


Cicerone,
Can you please explain how you would apply the alligation technique for this problem? Thanks!
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 [#permalink] New post 12 Oct 2006, 05:47
Just saw your explanation for this problem in the other thread. Thanks much, Cicerone!
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Re: Another mixture solution [#permalink] New post 13 Oct 2006, 02:00
let x ounce be added

so (20+x)*25/100=20*20/100 + x
solving for x = 4/3
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 [#permalink] New post 13 Oct 2006, 12:21
Using the alligation technique cicerone so kindly informed us of :lol: :

20----------------------------100
--------------25-----------------
75------------------------------5


(20/75) * 5 = 20/15 = 4/3
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 [#permalink] New post 14 Oct 2006, 06:30
this is the best technique ever!!
thanks Ciceron :lol:
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  [#permalink] 14 Oct 2006, 06:30
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John has 20 ounces of a 20% of salt solution. How much salt

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