Solve the problem.
-Caroleʹs car averages 12.9 mi/gal in city driving and 21.8 mi/gal in highway driving. If she drove a total of 320.3 mi on 20 gal of gas, how many of the gallons were used for city driving?
A) 15 gal
B) 12 gal
C) 13 gal
D) 7 gal

Question

Quizplus · Accepted Answer

Let x be the gallons used for city driving and (20 - x) be the gallons used for highway driving. The total distance covered can be represented by the equation 12.9x + 21.8(20 - x) = 320.3. Solving for x gives x = 13 gallons for city driving.

Solve the Problem. -Caroleʹs Car Averages 12.9 Mi/gal in City Driving and 21.8