GRE Question of the Day (May 30)

Math

At the beginning of a trip, the tank of Diana’s car was filled with gasoline to half of its capacity. During the trip, Diana used 30 percent of the gasoline in the tank. At the end of the trip, Diana added 8 gallons of gasoline to the tank. The capacity of the tank of Diana’s car was x gallons. Which of the following expressions represent the number of gallons of gasoline in the tank after Diana added gasoline to the tank at the end of the trip?

Indicate all such expressions.

A. $\frac{x}{2} - \frac{3x}{20} +8$
B. $\frac{7x}{20} +8$
C. $\frac{3x}{20} +8$
D. $\frac{x}{2} + \frac{3x}{20} -8$
E. $\frac{7x}{20} -8$