How are abstentions counted for a quorum and final vote?

How are abstentions counted for a quorum and final vote?

OAG 78-619 says that where a quorum is present, those members who abstain from voting are counted with the majority vote, either “for” or “against” a measure. This "counts with the majority" rule was originally set forth in Pierson-Trapp Co. v. Knippenberg, 387 S.W.2d 587, 1965.