Question 66305
(8+x)18.2=267+310
145.6+18.2x=577
18.2x=577-145.6
18.2x=431.4
x=431.4/18.2
x=23.703296 gallons of gas in the tank before starting the trip.
proof
(8+23.703296)18.2=577
31.703296*18.2=577
577=577