SOLUTION: How many liters of water must be evaporated from 200 liters of a 4% salt solution so that the remaining solution will be 6.4% salt solution?

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Question 985315: How many liters of water must be evaporated from 200 liters of a 4% salt solution so that the remaining solution will be 6.4% salt solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
E, the volume in liters to evaporate. The salt stays, but some water leaves.

200%2A4%2F%28200-E%29=6.4