TT12-14

Q14:

Box W and Box V each contain several blue sticks and red sticks, and all of the red sticks have the same length.  The length of each red stick is 18 inches less than the average length of the sticks in Box W and 6 inches greater than the average length of the sticks in Box V.  What is the average (arithmetic mean) length, in inches, of the sticks in Box W minus the average length, in inches, of the sticks in Box V?

 A 3

 B 6

 C 12

 D 18

 E 24

没看着讨论，记得这题我哪里看到过一次，貌似是PREP，忘了实在，就来麻烦大家啦，谢谢啊！！ 

设w中的sticks平均长为m，v中的sticks平均长为n，得到：m-18=n-6

so：m-n=24