SOLUTION: I have 550ml of a 70% solution. I want to make it an 80% solution. How many mls of a 90% solution must I add to the 70% to make it 80%?

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Question 727677: I have 550ml of a 70% solution. I want to make it an 80% solution. How many mls of a 90% solution must I add to the 70% to make it 80%?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let v = ml.s of the 90% solution to add.

highlight%28%28550%2A70%2Bv%2A90%29%2F%28550%2Bv%29=80%29.
Solve for v.