SOLUTION: How many kilograms of water must be evaporated from 8 kg of a 25% salt solution to produce a 40% salt solution?

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Question 318274: How many kilograms of water must be evaporated from 8 kg of a 25% salt solution to produce a 40% salt solution?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
8 kg * 25% = 2 kg salt

2 / (8-x) = 40%

2 = 3.2 - .4x

-1.2 = -.4x

3 = x