SOLUTION: How much water must be evaporated from 28 ounces of a 5% salt solution to make a 7% salt solution

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Question 408285: How much water must be evaporated from 28 ounces of a 5% salt solution to make a 7% salt solution
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
(final ounces of salt)/(final ounces of solution) = 7%
salt in 5% solution= .05%2A28+=+1.4 ounces
Let x = ounces of water evaporated from solution
1.4%2F%2828+-+x%29+=+.07
1.4+=+.07%2A%2828+-+x%29
1.4+=+1.96+-+.07x
.07x+=+.56
x+=+8
8 ounces of water must be evaporated
check:
1.4%2F%2828+-+8%29+=+.07
1.4%2F20+=+.07
1.4+=+1.4
OK