Question

Trina's car uses 12 gallons of gas to travel 144 miles. If she has 6 gallons of gas in the tank, how much more gas will she need to drive 240 miles?
A.
20 gallons
B.
18 gallons
C.
12 gallons
D.
14 gallons

Answer 1

set up a proportion for both situations, where
(# of gallons / # of miles) = (2nd # of gallons/2nd # of miles). in this case, your "2nd # of gallons" is an unknown, so you can let this be x. once you solve for x, this'll give you the # of gallons needed to drive 240 miles. *however* keep in mind she already has 6 gallons, so you'll need to subtract 6 from this result.