To determine how many gallons of gas you would need to drive 700 miles in a car that gets 35 miles per gallon, you can use a simple formula:
Gallons Needed = Total Miles / Miles Per Gallon
In this case, you will divide 700 miles by 35 miles per gallon:
Gallons Needed = 700 miles / 35 miles per gallon = 20 gallons
So, you would need 20 gallons of gas to drive 700 miles.