Question 891181
If the average of three numbers is V. If one of the numbers is Z and another is Y, 
what is the remaining number?
<pre>
Let X = the remaining number.  Then to find the average of three numbers
you add them and divide by 3:

{{{(X+Y+Z)/3}}}{{{""=""}}}{{{V}}}

{{{X+Y+Z}}}{{{""=""}}}{{{3V}}}

{{{X}}}{{{""=""}}}{{{3V-Y-Z}}}

Edwin</pre>