So I don’t know how many gallons Brady Jeep can hold but on average it would be between 18-20 gallons (according to google) so let’s go with 18. I also don’t know how many miles brandy is driving but 5 gallons (of gas) is 105 miles and 5 gallons (of gas) is $7. Let’s say he needed a full tank. 18 gallons of gas is 378 miles total. Since he already has 5 gallons, he would need to pay $18.02 to fill his tank up completely. Not sure what the question is asking but there you go.