Question

A gallon of milk weighs eight pounds, so you wouldn't try to carry three or four gallons home on your bicycle. gasoline is a bit less dense than milk—oil floats on water—and 6 pounds per gallon of gasoline is about right. a typical u.s. "car" (whatever it is we drive—averaging somewhere between a prius and a hummer, and including a lot of pickup trucks and minivans) gets about 20 miles per gallon, and drives about 12,000 miles. so, how many gallons of gas per year?

Answer 1

600 gallons per year.
take the total amount of miles driven and divide by the miles per gallon to get the average gallons used per year. (the other information is meant to be a distractor.) 12000/20 = 600 

Answer 2

The number of gallons of gas per year used by the vehicles is gotten as; 600 gallons per year.

How to solve proportions?

600 gallons per year.

We are told that;

Vehicles get gets about 20 miles per gallon.

Vehicles drive about 12,000 miles.

Thus;

Number of gallons per year will be gotten by dividing the total amount of miles driven by the miles per gallon

Thus;

Number of gallons per year =  12000/20

Number of gallons per year = 600

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