An empty fuel tank is filled with brand Z gasoline. When the tank is 1/4 empty, it is filled with brand Y gasoline. When the tank is half empty again, it is filled with brand Z gasoline. When the tank is half empty again, it is filled with brand Y gasoline. At this time, what percent of the gasoline in the tank is brand Z?
Pick one
A) 31.25%
B) 30%
C) 40%
D) 50%
E) 45%
Work with fraction of brand Z in the tank.   1st step: brand Z is 1   2nd step: brand Z is 1/4   3rd step: brand Z is (1/2)*(1/4) + 1/2 =5/8   4th step: brand Z is (1/2)*(5/8) = 5/16   31.25%nswer (31.25%)
<result>A</result>
An empty fuel tank is filled with brand Z gasoline. When the tank is 1/4 empty, it is filled with brand Y gasoline. When the tank is half empty again, it is filled with brand Z gasoline. When the tank is half empty again, it is filled with brand Y gasoline. At this time, what percent of the gasoline in the tank is brand Z?