To transact business, supervisors who represent more than one-half of the members and whose votes constitute more than 50 percent of the total votes of all supervisors must be present. No proxies shall be allowed. A smaller number may adjourn to a later date, provided notice is given to all members as if such adjourned meeting were a special meeting. If a quorum is not attained at two consecutive regular meetings, a quorum may be attained at the next regular meeting by the presence of either supervisors from one-half of the members or supervisors whose votes constitute 50 percent of the total votes of all supervisors.