SOLUTION: If the average (arithmetic mean) of 7, 8, 9, and x is 10, what is the value of x?

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Question 494540: If the average (arithmetic mean) of 7, 8, 9, and x is 10, what is the value of x?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(7+8+9+x)/4=10
24+x=10*4
x=40-24
x=16