Rex fills his gas tank up with 8 gallons of gas which cost him $24. How much would it cost to for him to fill up a 12 gallon tank?
$24/8 gallons = $3 per gallon.
So a 12 gallon tank costs 12*3 = $36
$24/8 gallons = $3 per gallon.
So a 12 gallon tank costs 12*3 = $36