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Hard Solutions /Mixture problem 600-700 level [#permalink]
08 Nov 2010, 13:02

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Difficulty:

25% (low)

Question Stats:

77% (02:40) correct
23% (01:47) wrong based on 103 sessions

Solution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solutions Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new liquid solution is liquid X?

Re: Hard Solutions /Mixture problem 600-700 level [#permalink]
08 Nov 2010, 23:01

Answer:C Took time to solve this one, the statement 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid was confusing to me. After thinking more deeply, it was clear to me that new 2 kg of solution Y will also be 30% liquid X and 70% water, and then I was able to get the answer. That was a bit tricky and nice question. Kudos +1 for posting the question _________________

"Don't be afraid of the space between your dreams and reality. If you can dream it, you can make it so." Target=780 http://challengemba.blogspot.com Kudos??

Re: Hard Solutions /Mixture problem 600-700 level [#permalink]
08 Nov 2010, 23:25

Initially you start with 8kg of solution which has 2.4kg of X and 5.6kg of water Post evaporation : 2.4kg of X and 3.6kg of water Now we add back 2kg of Y --> 1.4Kg water + 0.6Kg X So we have left 5Kg Water & 3Kg X

Percentage concentration is (3/5)*100 or 37.5% _________________

Re: Hard Solutions /Mixture problem 600-700 level [#permalink]
08 Nov 2010, 23:43

shrouded1 wrote:

Initially you start with 8kg of solution which has 2.4kg of X and 5.6kg of water Post evaporation : 2.4kg of X and 3.6kg of water Now we add back 2kg of Y --> 1.4Kg water + 0.6Kg X So we have left 5Kg Water & 3Kg X

Percentage concentration is (3/5)*100 or 37.5%

Yea, that's exactly how I solved but you know at first I was kinda adding 2 to 6 kg without considering liquid X and water's concentration within 2 kg being added. _________________

"Don't be afraid of the space between your dreams and reality. If you can dream it, you can make it so." Target=780 http://challengemba.blogspot.com Kudos??

Re: Hard Solutions /Mixture problem 600-700 level [#permalink]
11 Dec 2011, 22:43

Initially we have 8kg of solution which has 3/10 0f 8= 2.4kg of X and 7/10 of 8 = 5.6kg of water after evaporation : 2.4kg of X and 3.6kg of water Now we added 2kg of solution Y --> 7/10 of 2=1.4Kg water + 3/10 0f 2 =0.6Kg X So we have left 5Kg Water & 3Kg X

Percentage concentration is (3/5)*100 or 37.5%

gmatclubot

Re: Hard Solutions /Mixture problem 600-700 level
[#permalink]
11 Dec 2011, 22:43