Question

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?
Miles Traveled : 243.8
Gallons Used : 7.71

A. 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.

B. 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.

C. 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.

D. 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.

Answer 1

Answer:

D

Step-by-step explanation:

Since Alyssa wants to know her gas mileage, which is MILES PER GALLON, she will need to divide total miles by total gallons.

"per gallon" means per 1 unit of gallon, which we will get ONLY IF WE DIVIDE by TOTAL NUMBER OF GALLONS, hence we get "per unit of gallon".

So we need to divide 243.8 miles by 7.71 gallons to get Alyssa's gas mileage.

Answer choice D is right.