SOLUTION: how much water must be evaporated from 32 ounces of a 4% salt solution to make a 6% slat solution?

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Question 266638: how much water must be evaporated from 32 ounces of a 4% salt solution to make a 6% slat solution?
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
this is a mixture problem. Here is a table based on the given information
solutions . . . . . . . % . . . . . . . . ounces . . . . . . . . . .%ounces
salt . . . . . . . . . . .4 . . . . . . . . .32 . . . . . . . . . . . . . . .128
water . . . . . . . . .0 . . . . . . . . . x . . . . . . . . . . . . . . . .0
mixture. . . . . . . 6 . . . . . . . . . x + 12. . . . . . . . . . . . 6x + 72
looking at the third column, we have
128+%2B+0+=+6x+%2B+72
subtract 72 to get
56+=+6x
dividing, we get
x+=+9.33