A 9-quart cooling system is checked and found to be filled with a solution that is 10% antifreeze. The desired strength of the solution is 70% antifreeze. How many quarts of solution need to be drained and replaced with pure antifreeze to reach the desires strength?
A. 8 qt
B. 7 qt
C. 10 qt
D. 6 qt
E. 13 qt
Answer: D
Mathematics
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