SOLUTION: How much water must be added to 20 liters of 50% antifreeze solution to reduce it to 40% antifreeze?

Question 337439: How much water must be added to 20 liters of 50% antifreeze solution to reduce it to 40% antifreeze?
Found 2 solutions by Fombitz, nyc_function:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let A be the amount of 0% antifreeze (pure water).

liters
Answer by nyc_function(2741) (Show Source): You can put this solution on YOUR website!
Let w = how much water must be added
w + 20(.50) = 0.40(w + 20)
Can you take it from here?

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