Alyssa wants to know the gas mileage of her new car. She kept track of the number of miles she traveled and the number of gallons she used. Which method and reasoning can Alyssa use to calculate the gas mileage in miles per gallon?
243.8 miles × 7.71 gallons, because multiplying a quantity with units of miles by a quantity with units of gallons gives a quantity with units of miles per gallon.
243.8 miles − 7.71 gallons, because subtracting a quantity with units of gallons from a quantity with units of miles gives a quantity with units of miles per gallon.
7.71 gallons ÷ 243.8 miles, because dividing a quantity with units of gallons by a quantity with units of miles gives a quantity with units of miles per gallon.
243.8 miles ÷ 7.71 gallons, because dividing a quantity with units of miles by a quantity with units of gallons gives a quantity with units of miles per gallon.
The correct method for Alyssa to calculate the gas mileage in miles per gallon is:
243.8 miles ÷ 7.71 gallons, because dividing a quantity with units of miles (the distance traveled) by a quantity with units of gallons (the fuel used) gives a quantity with units of miles per gallon. This means you are determining how many miles Alyssa can drive for each gallon of fuel she uses.
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