Question 838299
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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*135 - x = .85(135-x)}}}
     {{{(.05*135)/.15 = x }}}  x = 45oz must be evaporated