SOLUTION: How much water must be evaporated from 20 ounces of a 1 % salt solution to make a 5 % salt solution?

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Question 900833: How much water must be evaporated from 20 ounces of a 1 % salt solution to make a 5 % salt solution?
Found 3 solutions by ewatrrr, josgarithmetic, richwmiller:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
water = Water
.99(20oz) - x = .95(20oz - x)
.04(20oz)/.05 = x

Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Ounce, as in 1%2F16 of a pound.

Let w = how many ounces to be evaporated.
20%2A%280.01%29%2F%2820-w%29=0.05
20%2A1%2F%2820-w%29=5
20=5%2820-w%29
20=100-5w
20-100=-5w
-80=-5w
w=80%2F5
highlight%28w=16%29 ounces
OR
highlight%28w=1%29 POUND

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
This is water removed and not replaced.
0.01*20=0.05*x
0.2=0.05x
x=4 new total amount
Remove 16 ounces
0.05*4=0.2
4/20=1/5=.20