If this is the new constitution on amendments:
. The Congress, whenever two thirds of the membership of both Houses shall deem it necessary, shall have power to propose amendments to this Constitution, which shall take effect following their ratification by two thirds of the several Regions.
two thirds of membership means what, the total of members in the body so 4/6 for Senate and 6/9 for House?
It doesn't depend on the number of legislators voting. If there is a vacancy is the membership total lower or it is always the total of seats in the constitution.