Sorry I didn't get to this sooner.
John asked a good questions, as it will depend on how much "other" stuff there is to eat.
When I do ribs, that's about all I do, so I make more.
"standard ribs" is that full spares or St. Louis trimmed.
Adult males usually 1/2 rack per
Adult females usually 2 or 3 bones.
Kids it depends.
Let us know how the amount/quantity goes for you, might help the next guy asking.
Good luck.
Smokin'