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

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Director
Joined: 06 Sep 2006
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John has 20 ounces of a 20% of salt solution. How much salt [#permalink]  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?
Manager
Joined: 01 Jun 2006
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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!
Director
Joined: 23 Jun 2005
Posts: 847
GMAT 1: 740 Q48 V42
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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.
Senior Manager
Joined: 28 Aug 2006
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Obviously the volume will increase.
It must be 4/3 ounces.

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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Director
Joined: 23 Jun 2005
Posts: 847
GMAT 1: 740 Q48 V42
Followers: 5

Kudos [?]: 31 [0], given: 1

cicerone wrote:
Obviously the volume will increase.
It must be 4/3 ounces.

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!
Director
Joined: 23 Jun 2005
Posts: 847
GMAT 1: 740 Q48 V42
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Kudos [?]: 31 [0], given: 1

Just saw your explanation for this problem in the other thread. Thanks much, Cicerone!
Senior Manager
Joined: 05 Oct 2006
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Re: Another mixture solution [#permalink]  13 Oct 2006, 02:00

so (20+x)*25/100=20*20/100 + x
solving for x = 4/3
Senior Manager
Joined: 30 Aug 2006
Posts: 374
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Using the alligation technique cicerone so kindly informed us of :

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

(20/75) * 5 = 20/15 = 4/3
Intern
Joined: 24 Sep 2006
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this is the best technique ever!!
thanks Ciceron
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