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Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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 08 Nov 2010, 14:02
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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? A. 30% B. 33 1/3% C. 37 1/2% D. 40% E. 50%
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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08 Nov 2010, 14:16
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At the beggining, you have 8KG of solution Y, i.e.
70% * 8KG = 5,6 KG of Water
30% * 8KG = 2,4 KG of X
2KG of water evaporate:
5,6KG - 2KG = 3,6KG of Water
2,4KG of X
2KG of liquid are added:
3,6KG + 2*0,70 = 5KG of Water
2,4KG + 2*0,30 = 3 KG of X
So you have 3KG of X in 8KG (3 + 5) solution.
Therefore X concentration is 3/8 = 37,5%
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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09 Nov 2010, 00:01
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Answer:CTook 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 
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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09 Nov 2010, 00:25
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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%
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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09 Nov 2010, 00:43
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.
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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10 Dec 2011, 13:51
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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11 Dec 2011, 23:43
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%
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Re: percent word problem [#permalink]
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rovshan85 wrote: Solution Y is 30% liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kg of solution Y and 2 kg of solution Y are added to the remaining 6 kg of liquid, what percent of this new solution is liquid X?
a. 30
b. 33 1/3
c. 37 1/2
d. 40
e. 50
What is the easiest way to approach this type of problem and solve under 2 min. In 8 kilograms of solution Y there are 0.3*8=2.4 kilograms of solution X; After 2 kilograms of water are replaced by 2 kilograms of solution Y, to the existing 2.4 kilograms of solution X, 0.3*2=0.6 kilograms of solution X are added, so in the new solution of 8 kilograms there are 2.4+0.6=3 kilograms of solution X, which is 3/8*100=37.5% of this new solution. Answer: C.
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Solution Y is 30 percent liquid X and 70 percent water. If 2 [#permalink]
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02 Jun 2012, 09:51
Solution Y total = 8
Liq x = 30% (8) = 2.4
Added 2 kg of Solution Y
Liq x = 30% (2) = 0.6
Final Solution wil have = (2.4 + 0.6) = 3 kg of Liq x
3/8 = 37.5%
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 [#permalink]
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26 Aug 2013, 21:32
rovshan85 wrote: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilograms of water evaporate from 8 kilograms of solution Y and 2 kilograms of solution Y are added to the remaining 6 kilograms of liquid, what percent of this new solution is liquid X?
A. 30%
B. 33 1/3%
C. 37 1/2%
D. 40%
E. 50%
What is the easiest way to approach this type of problem and solve under 2 min. 1. The net effect of 2 kg of water evaporating and adding 2 kg of the solution is removing (-2 + 1.4 = -0.6) 0.6 kg of water and adding 0.6 kg of liquid 2 Therefore the changed solution contains, 2.4 + 0.6 = 3 kg of liquid and 5.6-0.6==5 kg of water. 3. Percentage of liquid is 3/8 * 100 % = 37 1/2 %
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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28 Nov 2014, 06:24
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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04 Jan 2016, 12:21
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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05 Jan 2016, 05:55
rtaha2412 wrote: 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?
A. 30%
B. 33 1/3%
C. 37 1/2%
D. 40%
E. 50% The best way to solve these problems is to take one step at a timeInitial: 8 kg Solution Y This means Solution X = 2.4 kg, Water = 5.6 kg Step 2: 2 kg of water is evaporated. Left over: Solution X = 2.4 kg and Water = 3.6 kg Step 3: 2 kg of Solutoin Y is added Or, 0.6 kg of Solution X and 1.4 kg of water is added Final: Solution X = 3, Water = 5 % of solution X = 3/8 * 100 = 37.5% Option C
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Re: Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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03 May 2016, 07:47
rtaha2412 wrote: 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?
A. 30%
B. 33 1/3%
C. 37 1/2%
D. 40%
E. 50% Hi, I like using a table for mixture problems. This is what I came up with (see attachement):
Attachments
Sol gmat.JPG [ 31.44 KiB | Viewed 2244 times ]
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Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram [#permalink]
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18 Jul 2016, 20:23
let x=% of liquid X in new solution
.3*8+.3*2=8x
x=3/8=37.5%
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Solution Y is 30 percent liquid X and 70 percent water. If 2 kilogram
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18 Jul 2016, 20:23
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