Question

a car can travel 476 miles on 14 gallons of gas. Write an equation relating the distance d to the number of gallon g. How many gallons of gas does this car need to travel 578 miles.

Answer 1

mileage per gallon = Total mileage run/number of gallons used:
476/14 = 34 mi/gal

For 578 miles he will need 1 gallon each 34 miles or
(578 mi) /(34 mi/gal) = 17 gal.

Answer 2

miles per gallon (x) = d/g

x = 476/14 = x = 34 miles per gallon

so d/x = g

578/34 = 17 gallons are needed