Solve the Problem $15.5 \mathrm { mi } / \mathrm { gal }$

Multiple Choice

Solve the problem.
-Carole's car averages $15.5 \mathrm { mi } / \mathrm { gal }$ in city driving and $25.8 \mathrm { mi } / \mathrm { gal }$ in highway driving. If she drove a total of $593.6 \mathrm { mi }$ on $27 \mathrm { gal }$ of gas, how many of the gallons were used for city driving?

A) $10 \mathrm { gal }$
B) $22 \mathrm { gal }$
C) 12 gal
D) $17 \mathrm { gal }$