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

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Manager
Joined: 26 Dec 2003
Posts: 227
Location: India
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A solution of salt and water contains 15% salt by weight. Of [#permalink]  19 Feb 2004, 09:00
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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?
SVP
Joined: 30 Oct 2003
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Location: NewJersey USA
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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
Manager
Joined: 16 Jan 2004
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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
Manager
Joined: 26 Dec 2003
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guys just think, how did u get 18 kg as the original quantity of salt when 30 kg has already evapourated. Try again
Director
Joined: 03 Jul 2003
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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?

If you meant amount of original solution, than it is 120 Kgs.

My method also same as Anand's.
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