SOLUTION: How much water must be evaporated from 15 qt of a 65% antifreeze solution to produce a 75% solution? I dont know how i would go on to breaking this problem down

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Question 899055: How much water must be evaporated from 15 qt of a 65% antifreeze solution to produce a 75% solution?
I dont know how i would go on to breaking this problem down
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

The Idea is Water = Water

.35(15Qt) - x = .25(15Qt - x)

 .10(15Qt) = .75x

 .10(15Qt)/.75 = x = 2 Qts water needs  to be evaporated