Please Help this is killing me right now. I know how to solve this word problem once it is set up, but I just don't know how to set it up.
The radiator of a car needs to contain 40 liters of 40% anti freeze. The radiator now contains 40 liters of 20% antifreeze. How many liters of this solution must be drained and replaced with 100% antifreeze to get the desired strength?

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makes sense?

so 30 liters? 30 liters must stay so 10 liters need to be drained?

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