A majority of the members of a board of school directors shall be a quorum. If less than a majority is present at any meeting, no business shall be transacted at such meeting, but the members present may adjourn to some stated time: Provided, That if there shall be a minority of the board present, because a majority of the seats are vacant, then in such case the minority members at any such meeting may fill vacancies in the manner provided in this act.
24 P.S. § 4-422