sat 史上最难最崩溃的题目.关键是我看不懂
看题：
Barb's motor scooter has a 2-gallon gas tank and can travel "m" miles on 1 gallon of gas.If gas costs $1.25 per gallon and Barb spends "d" dollars to fill the tank; which of the following represents the amount of gas,that was in the tank before she filled it?
选项：
A:2/1.25
B:(d/1.25) -2
C:2- (d/1.25)
D:2- (md/1.25)
E:2- {(m/d)/1.25}
别和我说排除法~
用了个很惊悚的题目,见谅
感谢回答的所有人