Looking to get a breakdown of this problem like the other ones are answered :)

Ok maybe I need to type out the whole question?

Here it is as the textbook has it:

In Exercises 75 through 86, write a program to solve the problem and display the answer in a list box. The program should use variables for each of the quantities.

78. Gas Mileage. A motorist wants to determine her gas mileage. At 23,532 miles (on the odometer) the tank is filled. At 23,695 miles the tank is filled again with 14 gallons. How many miles per gallon did the car average between the two fillings? See Fig. 3.4.

And Fig. 3.4 is A picture of a box called Mileage with a single button on it called "Computer Gas Mileage" and there is an output box below it with the answer 24.5