Question 629928
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Hi,
A salesperson purchased a car that was advertised as averaging 25 mi/gal in the city and 40 mi/gal on the highway. 
A recent sales trip that covered 1800 miles used 51 gallons of gasoline. Assuming that the advertised mileage estimates were correct, how many miles{{{highlight(x)}}} were driven in the city?
Question states*** 51 gal used
 {{{x/25 + (1800-x)/40 = 51}}}   |Multiplying thru by 200 so as all denominators = 1
 8x + 5(1800-x) = 10200     | Solve for x