SOLUTION: If the average of three numbers is V. If one of the numbers is Z and another is Y, what is the remaining number?

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Question 262810: If the average of three numbers is V. If one of the numbers is Z and another is Y, what is the remaining number?
Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
Let X, Y, and Z be the 3 numbers. Ten we get
V+=+%28x%2By%2Bz%29%2F3%29
The remaining number is x.
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step 1 - multiply by 3 to get
3V+=+x+%2B+y+%2B+z
step 2 - subtract y and z to get x as
3V-Y+-+Z+=+X