SOLUTION: Carole's car averages 12.8 miles per gallon in city driving and 21.6 miles per gallon in highway driving. If she drove a total of 308.8 miles on 20 gallons of gas, how much of the

Question 1152022: Carole's car averages 12.8 miles per gallon in city driving and 21.6 miles per gallon in highway driving. If she drove a total of 308.8 miles on 20 gallons of gas, how much of the gas (to the nearest gallon) was used for city driving
Answer by josgarithmetic(39616) (Show Source): You can put this solution on YOUR website!
R, fuel efficiency
V, volume of fuel, gallons
D, distance in miles

Question asks for how many gallons used in the city. Let this quantity be v.

                  FUEL EFFC      VOL        DISTANCE
CITY              12.8            v         12.8v
HIGHWAY           21.6           20-v       21.6(20-v)
TOTAL                            20        308.8

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