Answer :
let x be how many gallons
let g be distance travelled on a gallon
g = 20
x*g = 100
20x = 100
x = 100/20 = 5
hope that helps :)
let g be distance travelled on a gallon
g = 20
x*g = 100
20x = 100
x = 100/20 = 5
hope that helps :)