SOLUTION: On a trip, Dave drives 267 miles, adds 8 gallons of gas to his tank, and drives another 310 miles before running out of gas. If Dave's car averages 18.2 miles per gallon, how many

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Question 66305: On a trip, Dave drives 267 miles, adds 8 gallons of gas to his tank, and drives another 310 miles before running out of gas. If Dave's car averages 18.2 miles per gallon, how many gallons did Dave already have in his tank before starting this trip?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
(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