Solve.Carole's car averages 15.9 mi/gal in city driving and 24.8 mi/gal in highway driving. If she drove a total of 531.0 mi on 25 gal of gas, how many of the gallons were used for city driving?
A. 10 gal
B. 20 gal
C. 12 gal
D. 15 gal
Answer: A
Mathematics
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, 
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