GRE
The price after discounted 15% and then $20 off
The price after $20 off and then discounted 15%
The time it took car G to travel $$x$$ miles at the average rate of $$y$$ miles per hour
The time it took car H to travel $$w$$ miles at the average rate of $$z$$ miles per hour
Principal plus interest after two years
S(1+2r%)
25000 +道题目
6本备考书籍