Mrs. Doggendorf drove 45 miles and used 3 3/4 gallons of gas. Her sister Kelly, drove 85 miles and used 8 2/3 gallons of gas. Which driver used fewer gallons of gas per mile

Mrs.Doggendorf has fewer gallons per mile

Step-by-step explanation:

Mrs.Doggendorf drove 45 miles and used 3 3/4 gallons of gas

The miles per gallon is

convert  3 3/4 gallons to simple fraction= 15/4 gallons

miles per gallon= 45/15/4

miles per gallon= 45*4/15

miles per gallon= 12 miles per gallon

gallons per mile= 1/12

Kelly, drove 85 miles and used 8 2/3 gallons of gas

convert 8 2/3 gallons to simple fraction= 26/3 gallons

miles per gallon= 85/26/3

miles per gallon= 85*3/26

miles per gallon=9.80 miles per gallon

gallons per mile= 1/9.80

Hence Mrs.Doggendorf has fewer gallons per mile