AI was wondering why bakeries only make even numbers servings 10, 20, 30, etc My local bakery only makes even servings for everything else but ready to go "express cakes" i was wonderin the reaon why and if that is the industry standard.

I've actually never heard of this. Maybe it has to do with the pans they have on hand or with simplifying their ordering system. Also, it forces you to buy more cake than you need. If you need cake for 23, you can't get cake for 24 or 25, but automatically get bumped up to 30!