Alvin’s family used 20.5 gallons of gas to drive 492 miles. how many miles did they drive on each gallon of gas

Ill mark the brainliest if you me with the these three questions 7,8,9

What is the result of the following division?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?