SOLUTION: how much water must be evaporated from 64oz of 2% solution to make a 10% solution?

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Question 548090: how much water must be evaporated from 64oz of 2% solution to make a 10% solution?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how much water must be evaporated from 64oz of 2% solution to make a 10% solution?
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Equation:
water - water = water
0.98*64 + x = 0.90(64+x)
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Multiply thru by 100 and solve for "x":
98*64 + 100x = 90*64 + 90x
10x = -8*64
x = 51.2 oz (amt. that must be evaporated)
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Cheers,
Stan H.