Decisions of the Board of Zoning Appeals. The concurring vote of three members of the Board shall be necessary to reverse any order, requirement, decision or determination of the Zoning Administrator, or to decide in favor of the applicant on any matter upon which it is required to pass under this Part 1, or to effect any variation of this Part 1. The Board shall keep minutes of its proceedings, showing the vote of each member upon each question, or if absent or failing to vote, indicating such fact, and shall keep records of its examinations and other official actions, all of which shall be filed immediately in the office of the Board and shall be public record. On all appeals, applications and other matters brought before the Board of Zoning Appeals, the Board shall inform in writing all the parties involved of its decisions and the reasons therefor.