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?

expression #3 is not equivalent. the others are.

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you