SOLUTION: what is the missing number if you have 1,3,5,_ and the mean number is4

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Question 240046: what is the missing number if you have 1,3,5,_ and the mean number is4
Answer by CubeyThePenguin(3113) About Me  (Show Source):
You can put this solution on YOUR website!
(1 + 3 + 5 + x)/4 = 4
1 + 3 + 5 + x = 16
9 + x = 16
x = 7