A majority of the number of directors as fixed pursuant to Section 53-11-36 N.M. Stat. Ann. shall constitute a quorum for the transaction of business unless a greater number is required by the articles of incorporation or the bylaws. A quorum, once attained at a meeting, shall be deemed to continue until adjournment notwithstanding the voluntary withdrawal of enough directors to leave less than a quorum. The act of the majority of the directors present at a meeting at which a quorum is present shall be the act of the board of directors, unless the act of a greater number is required by the articles of incorporation or the bylaws.