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A solution of salt and water contains 15% salt by weight. Of

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A solution of salt and water contains 15% salt by weight. Of [#permalink] New post 19 Feb 2004, 10:00
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A solution of salt and water contains 15% salt by weight. Of it 30 kg water evaporates and the solution now contains 20% of salt. Find the original quantity of salt?
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 [#permalink] New post 19 Feb 2004, 10:30
S/(S+W) = 0.15
0.85S = 0.15W or 17S = 3W

S/(S+W1) = 0.2
W1 = W-30
0.8S = 0.2W-6 or 4S = W-30
12S = 3W-90
17S = 3W
so 5S = 90 or S = 18 Kg
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 [#permalink] New post 19 Feb 2004, 12:54
Kpadma

Can you post your approach please if different from anandk. I am trying to find out a diff way of solving this but cannot comeup with one
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 [#permalink] New post 19 Feb 2004, 17:35
guys just think, how did u get 18 kg as the original quantity of salt when 30 kg has already evapourated. Try again
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 [#permalink] New post 19 Feb 2004, 19:11
rakesh1239 wrote:
guys just think, how did u get 18 kg as the original quantity of salt when 30 kg has already evapourated. Try again


Is the question asking the amount of salt in the solution or the original
amount of solution?

Your question clearly asking for salt; which is 18Kgs.
If you meant amount of original solution, than it is 120 Kgs.

My method also same as Anand's.
  [#permalink] 19 Feb 2004, 19:11
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