SOLUTION: A radiator contains 25 quarts of a water and antifreeze solution, which is 60% antifreeze. How much of this solution should be drained and replaced with water to obtain a solution

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Question 773670: A radiator contains 25 quarts of a water and antifreeze solution, which is 60% antifreeze. How
much of this solution should be drained and replaced with water to obtain a solution with 40%
antifreeze?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Let v = the volume in quarts of the current solution to remove from the radiator and replace.
%2825%2A60-v%2A60%2Bv%2A0%29%2F%2825%29=40
%2825%2A60-60%2Av%29%2F25=40
25%2A6-6%2Av=100
-6v=100-150
6v=50
v=8%261%2F3 quarts