求解三道GWD的题~~

西西小胖

1.The operation # represents either addition,substraction,or multiplication of intergers,what is the value of 1#0?
(1)0#2=2
(2)2#0=2
答案选A。
可是我觉得应该选D。因为2#0=2里#要么是加，要么是减。无论加减，带到1#0中，都等于1呀~我觉得自己想得挺对的……

2.Twice the average number of books that Carolyn read per week was greater than 5 less than twice the average number of books that Jacob read per week.这个到底说的是2C=2J-5，还是说5＜2C＜2J？C、J代表Carolyn和Jacob的平均读书量

3.From May 1 to May 30 in the same year, the balance in a checking account increased. What was the balance in the checking account on May 30?
(1)If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504

(2)During this period of time, the increase in the balance in the checking account was 8 percent.
我觉得这个题选C吧。（1）里面写的是if,不是现实状况吧。通过（1）算出May 1 有多少，然后代入（2）的0.08才能算出May 30的吧~~~答案选的是A

我的脑子没乱吧……才做几道题就有这么多问题，我真是担忧啊~~~~~