SOLUTION: How many ounces of water must be evaporated from 135 ounces of a 10% salt solution to make a 15% salt solution?

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Question 838299: How many ounces of water must be evaporated from 135 ounces of a 10% salt solution to make a 15% salt solution?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

many ounces of water must be evaporated from 135 ounces of a 10% salt solution (90% water) 

to make a 15% salt solution (85% water)?

Let x represent amount evaporated

          water = water

 .90%2A135+-+x+=+.85%28135-x%29

     %28.05%2A135%29%2F.15+=+x+  x = 45oz must be evaporated