SOLUTION: how much water must be evaporated from 32 ounces of a 3% salt solution to make a 8% salt solution?

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Question 758087: how much water must be evaporated from 32 ounces of a 3% salt solution to make a 8% salt solution?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
(Amount of Salt)/(Amount of solution and subtract some water)=(resulting concentration)

%2832%2A3%29%2F%2832-w%29=8 where w is the weight of water evaporated. "ounces" is for "weight". Solve for w.