SOLUTION: The cooling system of a car has a capacity of 15 liters. If the system is currently filled with a mixture that is 40% antifreeze, ow much of tis mixture should be drained and repla

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Question 778390: The cooling system of a car has a capacity of 15 liters. If the system is currently filled with a mixture that is 40% antifreeze, ow much of tis mixture should be drained and replaced with pure antifreeze so the system is filled with a solution that is 50% antifreeze?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
Let v = volume to drain and replace.
%2815%2A40-v%2A40%2Bv%2A100%29%2F15=50
%2815%2A40%2B60v%29%2F15=50
15%2A40%2B60v=15%2A50
15%2A4%2B6v=15%2A5
6v=15%285-4%29
6v=15
2v=5
v=2%261%2F2