The Board of Adjustment may reverse or affirm, wholly or in part, or may modify any order, requirement, decision or determination appealed from and may make such order, requirement, decision or determination as ought to be made and to that end shall have all the powers of the administrative officer. The concurring vote of two members of the Board shall be necessary to reverse any order, requirement, decision or determination appealed from, or to decide in favor of the applicant on any matter on which it is required to pass, or to effect any variation in the requirements of this chapter.