Bunuel wrote:

What was the average number of miles per gallon of gasoline consumed by Lorena's car during a certain trip?

(1) The car uses on average a gallon of gasoline for 18 miles driven

(2) The cost of the gasoline used by the car for the trip was $24

To calculate the average miles per gallon we need to know the amount of miles driven and the amount of gallons consumed.

We'll look for statements that give us this information, a Logical approach.

(1) does not give us the total number of miles driven or gallons used on Lorena's trip.

Insufficient.

(2) does not give us the miles driven or the amount of gallons used on Lorena's trip.

Insufficient.

Combined: Since there is no way to combine the information in the statements, we still cannot answer.

(E) is our answer.

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