[( m - 3 ) / 5] + [(m - 4 ) / 7] = 6 - [(2m - 1) / 35]

m = 18

Step-by-step explanation:

It took a while but I have the steps too. Don't know if I'm seeing your equation wrong but I tried.

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