How many liters of a 30% alcohol solution must be mixed with 50 liters of a 90% solution to get a 50% solution?

How many liters of a 30% alcohol solution must be mixed with 50 liters of a 90% solution to get a 50% solution?
A) 150 L
B) 100 L
C) 15 L
D) 10 L


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