SOLUTION: how much water must be evaporated from 28 ounces of a 3% salt solution to make a 7% salt solution?

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Question 218741: how much water must be evaporated from 28 ounces of a 3% salt solution to make a 7% salt solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how much water must be evaporated from 28 ounces of a 3% salt solution to make a 7% salt solution?
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Equation:
salt - salt = salt
0.03*28 - 0x = 0.07(28-x)
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Multiply thru by 100 to get:
3*38 = 7(28-x)
3*28 = 7*28 - 7x
7x = 4*28
x = 16 oz (Amt. of water that must be evaporated)
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Cheers,
Stan H.