SOLUTION: how much solution must be removed from 50ml of 30% acid solution and replaced with pure water to produce a 20% solution?

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Question 383999: how much solution must be removed from 50ml of 30% acid solution and replaced with pure water to produce a 20% solution?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(50 - x)(30%) + (x)(0%) = (50)(20%)