SOLUTION: The average of a set of numbers is 120. Only one number is different from the other three. What could be that number?

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Question 497453: The average of a set of numbers is 120. Only one number is different from the other three. What could be that number?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The average of a set of numbers is 120.
Only one number is different from the other three.
What could be that number?
let y = "that number"
let x = the 3 same numbers
:
%283x+%2B+y%29%2F4 = 120
3x + y = 4(120)
3x + y = 480
y = -3x + 480
:
Choose a value for x, find y,
let x = 130,
y = 3(130)+480
y = 390 + 480
y = 90 could be the number