Solve the problem.It is necessary to have a 40% antifreeze solution in the radiator of a certain car. 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. 12 liters
B. 15 liters
C. 7.5 liters
D. 10.0 liters
Answer: C
Mathematics
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