A petition asking for a referendum on a law, and requesting that the operation of such law be suspended, shall first be signed by ten qualified voters and shall then be filed with the secretary of the commonwealth not later than thirty days after the law that is the subject of the petition has become law. [The secretary of the commonwealth shall provide blanks for the use of subsequent signers, and shall print at the top of each blank a description of the proposed law as such description will appear on the ballot together with the names and residences of the first ten signers. If such petition is completed by filing with the secretary of the commonwealth not later than ninety days after the law which is the subject of the petition has become law the signatures of not less than fifteen thousand qualified voters of the commonwealth, then the operation of such law shall be suspended, and the secretary of the commonwealth shall submit such law to the people at the next state election, if thirty days intervene between the date when such petition is filed with the secretary of the commonwealth and the date for holding such state election; if thirty days do not so intervene, then such law shall be submitted to the people at the next following state election, unless in the meantime it shall have been repealed; and if it shall be approved by a majority of the qualified voters voting thereon, such law shall, subject to the provisions of the constitution, take effect in thirty days after such election, or at such time after such election as may be provided in such law; if not so approved such law shall be null and void; but no such law shall be held to be disapproved if the negative vote is less than thirty per cent of the total number of ballots cast at such state election.] [Section 3 amended by section 2 of Amendments, Art.LXXIV and section 4 of Amendments, Art. LXXXI]