The Deweys used 10.5 gallons of gas.
The Webers used 10.7 gallons of gas.
The Golds used 10.8 gallons of gas.
The Stones used 9 gallons of gas.

	Deweys	Webers	Golds	Stones
Miles per gallon	20	15	24	30
Find the miles driven.	210	210 –  50 160	160 +100   260	160 +110   270
Find the number of gallons used by dividing the miles driven by the miles per gallon.	210 20	160 15	260 24	270 30
Gallons used	10.5	10.6666	10.83	9
Gallons used (to nearest 0.1)	10.5	10.7	10.8	9