All business shall be considered at a meeting of the Committee, or the Board, as the case may be, and shall be decided by a majority of the votes of the members present and voting. In the event of an equality of votes the Chairman shall have a casting vote :
Provided that the Chairman may, if he thinks fit, direct that any matter shall be decided by the circulation of necessary papers and security written opinion of the members :
Provided further that no decision on any question which is referred under the first proviso shall be taken unless supported by not less than a two-third majority of the members.
20 . Mode of computation of cash value of wages.—In c o m p ut ing the cash value of wages paid in kind and all essential commodities supplied