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If 15 quarts of water evaporate from 60 quarts of a 3% salt

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Manager
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If 15 quarts of water evaporate from 60 quarts of a 3% salt [#permalink] New post 02 Feb 2008, 23:44
If 15 quarts of water evaporate from 60 quarts of a 3% salt solution, what is the percentage of salt in the new solution ?

1. 7/2%
2. 4%
3. 9/2%
4. 5%
5. 6%
Manager
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Re: 15 [#permalink] New post 03 Feb 2008, 06:49
blog wrote:
If 15 quarts of water evaporate from 60 quarts of a 3% salt solution, what is the percentage of salt in the new solution ?

1. 7/2%
2. 4%
3. 9/2%
4. 5%
5. 6%



60 quarters - 100%
x (amount of salt) - 3% => x=1.8

since evaporated thing is water salt remains the same amount and now we have 45 quarters of solution
45 quarters - 100%
1.8 (amount of salt) - x% => x=4%

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Re: 15 [#permalink] New post 03 Feb 2008, 11:32
answer is 4% before we had 1.8 q of salt, and 58.2q water. 15q evaporated, so we have 43.5q water, but still 1.8q salt.

1.8/45 = 4%

question: whats the most efficient way to do the last calculation ?
Re: 15   [#permalink] 03 Feb 2008, 11:32
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If 15 quarts of water evaporate from 60 quarts of a 3% salt

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