If you always change the same cell in the series then it's possible. For example:
A1: 10
B1: =(E1-A1)/3
C1: =(E1-A1)/3
D1: =(E1-A1)/3
E1: 100 (or other static number)
If you change A1 to 25, B1:D1 will change to 25. If you change A1 to 40, B1:D1 will change to 20. Etc..
Looks like Jason beat me to it..![]()
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