SOLUTION: how to get the answer when you have the average but you are missing a number in the number line aka a fill in the blank

Question 826003: how to get the answer when you have the average but you are missing a number in the number line aka a fill in the blank
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
I think this is what you're asking:

where is the average of the given
numbers including the missing number
------------------------------------
There are numbers, so you add them
and divide by to get the average
Multiply both sides by

------------
check:

OK
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