I had to read that confusing explanation about 50 times, but I think I've finally understood what you mean.
=IF(C141<>"",IF(D141<15,15,D141),"")
Don't use column F.
Or use JA's solution and column F is =max(D141,E141)
I had to read that confusing explanation about 50 times, but I think I've finally understood what you mean.
=IF(C141<>"",IF(D141<15,15,D141),"")
Don't use column F.
Or use JA's solution and column F is =max(D141,E141)