help with math expression

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

I have 2 fields: THW and TAF
Here is what I am trying to accomplish.
THW - 40 = X
X - TAF = what I want to show in the new field.

for example if THW is 43 and TAF is 2:
THW - 40 = 3
3 - TAF = 1(the result is what I want to show in my field).
I'm not quite sure how to put this together in the expression builder.
Any Ideas?
 
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