The distance travled in a car varies directly as the amount of gasoline used. If a car travles 640 miles and uses 32 gallons of gas, find the constant of variation or miles per gallon (mpg). (1 point)
To find the constant of variation or miles per gallon (mpg), we need to set up a proportion:
distance traveled / amount of gasoline used = miles per gallon
We know that the car traveled 640 miles and used 32 gallons of gas:
640 miles / 32 gallons = miles per gallon
The miles per gallon is 20 miles per gallon or 20 mpg.