SOLUTION: The average of numbers are 8. So if three of the numbers are 4, 8, and 9 what is the fourth number? 11 or 12?

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Question 462610: The average of numbers are 8. So if three of the numbers are 4, 8, and 9 what is the fourth number? 11 or 12?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(4+8+9+x)/4=8
21+x=8*4
21+x=32
x=11