The cooling system of a car has a capacity of 20 liters. If the system is currently filled with a mixture that is 60% antifreeze, how much of this mixture should be drained and replaced with pure antifreeze so that the system is filled with a solution that is 70% antifreeze?

1 answer

.60(20-x) + x = .70*20

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The cooling system of a car has a capacity of 20 liters. If the system is currently filled with a mixture that is 60​% ​antifreeze, how much of this mixture should be drained and replaced with pure antifreeze so that the system is filled with a solution that is 70% ​antifreeze?