The municipal clerk shall certify the results of the election to the legislative body of the municipality at its first meeting thereafter, enter the same at large in its minutes and certify the same to the secretary of state. In such certificates he shall specify whether or not a majority of the votes cast are for the adoption of chapters 70 to 76 of this title (s. 40:70-1 et seq.), and if they are, he shall further specify whether or not the number of votes cast in favor of such adoption is equal in number to at least thirty per cent of the total number of legal ballots cast in such municipality at the general election next preceding the submission of question of the adoption of said chapters 70 to 76 of this title.