If I understand: You have 5 values that have an average of 10. If one
of those values changes, you want to change one or more of the other
values so that the average remains 10.

I'm sure there are a lot of different approaches, my first thought
would be to use Solver. Set Target cell average equal to a value of 10
by changing the desired other cells subject to whatever constraints you
want to insure a unique solution. Note that the constraint "a4=a5" is
not allowed. You have to put the formula "=a4-a5" into another cell
and set the constraint b5=0.


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MrShorty
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