the randolphs used 12 more gallons of fuel oil in october than in september, and twice as much oil in november as in september. if they used 132 gallons for the 3 months, how much was used during each month?
used in Sept -- x
used in Oct --- x + 12
used in Nov --- 2x
x + x+12 + 2x = 132
simply solve for x, then sub into each of my definitions