SOLUTION: A radiator holds five gallons of fluid. If it is full with a 15% solution, how much fluid should be drained and replaced with a 65% antifreeze mixture to result in a 40% antifreeze

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Question 949996: A radiator holds five gallons of fluid. If it is full with a 15% solution, how much fluid should be drained and replaced with a 65% antifreeze mixture to result in a 40% antifreeze mixture?
Answer by josgarithmetic(39617) About Me  (Show Source):
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Drain and Replace: Radiator Antifreeze Mixture
http://www.algebra.com/my/drain-and-replace-antifreeze.lesson?content_action=show_dev