SOLUTION: A photographer wants to mix 4 liters of 3% solution with a 10% solution to get a 7% solution. How many liters of 10% solution must be added?

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Question 608842: A photographer wants to mix 4 liters of 3% solution with a 10% solution to get a 7% solution. How many liters of 10% solution must be added?
Answer by richwmiller(9135) About Me  (Show Source):
You can put this solution on YOUR website!
4*.03+.1*x=(4+x)*.07