Question 1160613
40 gallons* x mpg=40x miles, so x mpg is the fuel efficiency of the first car
30 gallons*(55-x)mpg=1650-30x miles
That sum is 1900 miles
so 10x+1650=1900
10x=250
x=25 mpg for car 1 and went 1000 miles
55-x=30 mpg for car 2 and went 900 miles