I really need help, or I will fail my grade :(

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Question
The fuel efficiency of a car is determined by its miles per gallon (mpg) number. This number estimates how many miles a car can run with a gallon of gas. Four carsâ€™ mpg numbers are given in different representations.
5. (4 points) List the cars in order, from the most fuel efficient to the least fuel efficient.
6. (4 points) Explain and support your answer with your work.
I really need help, or I will fail my grade :(

Picture http://i59.tinypic.com/1jm1lj.jpg

Question
The fuel efficiency of a car is determined by its miles per gallon (mpg) number. This number estimates how many miles a car can run with a gallon of gas. Four carsâ€™ mpg numbers are given in different representations.
5. (4 points) List the cars in order, from the most fuel efficient to the least fuel efficient.
6. (4 points) Explain and support your answer with your work.
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