24 V.S.A. App. ch. 401, § 13: Quorum

For the purpose of transacting business, the presence of 50 percent of the municipal representatives to the Board of Supervisors shall constitute a quorum. However, a smaller number may adjourn to another date. The entire number of regular representatives to be appointed to the Board under section 9 of this chapter shall be used to determine a quorum, regardless of whether vacancies exist.