[讨论]TT6-3没找到讨论

Q3:

Pat, Kate, and Mark charged a total of 162 hours to a certain project.  If Pat charged twice as much time to the project as Kate and 1/3 as much time as Mark, how many more hours did Mark charge to the project than Kate?

A.     18

B.     36

C.     72

D.     90

E.      108

Answer: D

汗！估计我哪里计算滞胀……

设P用x hours,则K 用0.5x, M用3X

 1/x+2/x+1/(3x)=1/162

怎么没答案？？？

还有，用置顶的那个讨论链接，怎么知道tt和GIGI的对应套数啊？

x+0.5x+3x=162

x=36

3x-0.5x=2.5x=2.5*36=90

晕！！！！！！！！！！！1

第一句话理解错了………………………………

呵呵,以后细心一点

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