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 ~$\frac{1}{3}$~ as much time as Mark, how many more hours did Mark charge to the project than Kate?
18
36
72
90
108
看清楚问题
没看清题,直接求了M
Mark-kate=108-18=90
卡在三分之一那了,不会反过来想实际上就是M是P的三倍
P=2K
P=1/3M
问题问的是 Mark比Kate多了多少
本题应该是E 108吧?