SOLUTION: The average of six numbers is 120. One number is removed and the new average is 110. What was the number removed?

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Question 840995: The average of six numbers is 120. One number is removed and the new average is 110. What was the number removed?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28A%2BB%2BC%2BD%2BE%2BF%29%2F6=120
1.A%2BB%2BC%2BD%2BE%2BF=720
Remove A
%28B%2BC%2BD%2BE%2BF%29%2F5=110
B%2BC%2BD%2BE%2BG=550
From eq. 1,
B%2BC%2BD%2BE%2BF=720-A
Substituting,
720-A=550
A=720-550
A=170