SOLUTION: A radiator contains 7 liters of a 25% antifreeze solution. How much should be drained and replaced with pure antifreeze to produce a 55% antifreeze solution? (Round your answer to

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Question 771437: A radiator contains 7 liters of a 25% antifreeze solution. How much should be drained and replaced with pure antifreeze to produce a 55% antifreeze solution? (Round your answer to two decimal places.)
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let v = the volume in liters of antifreeze to remove and then replace with pure antifreeze materaial.
%287%2A25-v%2A25%2Bv%2A100%29%2F7=55 and then solve for v.

I did not use any intermediate steps to compose that equation. Tell me if you need finer steps underlying that equation.