Asifpirlo wrote:
An empty fuel tank is filled with brand Z gasoline. When the tank is half 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?
A. 50%
B. 40%
C. 37.5%
D. 331⁄3%
E. 25%
Let’s say the tank starts with 32 gallons of gas (we use the number 32 because we can take half of this number many times over
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