请教MATH12—Q14

bdx2010

答案据说是E,没看明白，还请NN给看看~~非常感谢

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

bdx2010

请NN们指教，非常感谢！！