## Elementary Algebra

$= 78.1$ gallons
Add up the gallons of gasoline purchased on the trip to determine the total volume of gasoline purchased in gallons. $= 9.7 + 12.3 + 14.6 + 12.2 + 13.8 + 15.5$ $= 22 + 14.6+ 12.2 + 13.8 + 15.5$ $= 36.6 + 12.2 + 13.8 + 15.5$ $= 48.8 + 13.8 + 15.5$ $= 62.6 + 15.5$ $= 78.1$ gallons