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Red Balls

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by Mayur Sand » Wed Jul 22, 2009 12:29 pm
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


OA E
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by xilef » Wed Jul 22, 2009 12:55 pm
Red - R
W - average length of the sticks in Box W
V - average length of the sticks in Box V

R = W-18
R = V+6

W = R+18
V = R-6

x = R+18-(R-6)
x = 24
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Re: Red Balls

by El Cucu » Wed Jul 22, 2009 12:56 pm
Mayur Sand wrote: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


OA E
R= Aw-18 (Aw = average of W )
R= Av+6 (Av= average of V)

Aw= R+18
Av= R-6

(R+18) - (R-6)= 24
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