SOLUTION: How much water must be evaporated from 32 ounces of a 4% salt solution to make a 7% salt solution?

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Question 64610: How much water must be evaporated from 32 ounces of a 4% salt solution to make a 7% salt solution?
Answer by ptaylor(2198) About Me  (Show Source):
You can put this solution on YOUR website!
Let x=amount of water to be evaporated.
Now we know that the amount of pure salt remains the same before(32)(0.04) and after (32-x)(0.07) the evaporation process. Thus, our equation to solve is:
(32-x)(0.07)=(32)(0.04) simplifying
-0.07x+2.24=1.28 subtract 2.24 from both sides and we have:
-0.07x=-0.96
x=13.71 oz
ck
(32-13.71)(0.07)=(32)(0.04)
1.28=1.28
Hope this helps. Happy holidays.------ptaylor