Solve the problem.The radiator of a certain car requires a 40% antifreeze solution. The radiator now has 30 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?
A. 7.5 L
B. 15 L
C. 10.0 L
D. 12 L
Answer: A
Mathematics
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