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A solution of salt and water is 10 percent

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A solution of salt and water is 10 percent [#permalink] New post 08 Jun 2019, 05:36
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Question Stats:

50% (00:03) correct 50% (01:13) wrong based on 2 sessions
A solution of salt and water is 10 percent salt by weight. After a period of time under pressure and heat, a portion of the water evaporates so that the solution is 40 percent salt by weight. What is the ratio of the initial weight of water to the final weight of water in the solution?

(A) 1 to 6
(B) 1 to 4
(C) 1 to 3
(D) 4 to 1
(E) 6 to 1
[Reveal] Spoiler: OA
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Re: A solution of salt and water is 10 percent [#permalink] New post 09 Jun 2019, 11:53
Expert's post
let x=total units of original solution
let w=units of water evaporated
.9x-w=.6(x-w)→
x/w=4/3
substituting,
initial water weight=.9*4=3.6
final water weight=.9*4-3=.6
3.6/.6=6:1
E
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Re: A solution of salt and water is 10 percent   [#permalink] 09 Jun 2019, 11:53
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A solution of salt and water is 10 percent

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