Thanks for the responses guys - I have solved the problem with your
help.
This is the formula I have used and it works fine:
=F24+(SUM(F18,F20,F22)-MIN(F18,F20,F22))+(SUM(F19,F21,F23)-MIN(F19,F21,F23))
F24 is a constant and will be included in the calculation regardless of
other results.
Thanks again
Chris
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