In like manner and under like conditions as mentioned in the preceding sections, (a) separate road districts heretofore or hereafter created may be consolidated into a single separate road district; (b) a separate road district may be created from parts of two or more districts heretofore or hereafter created, or from territory partly of such a district or districts and partly of territory not theretofore in any separate road district; and (c) suitable territory, whether within or without a separate road district, may be added to an adjoining separate road district. All the qualified electors residing in each of the component parts of the territory proposed to be consolidated or joined in or added, as well as of the proposed district when completed, shall have the right to be heard and to vote in any election held as a part of said procedure. If twenty-five percent (25%) of the qualified electors in any one of the component parts aforesaid of the proposed territory or a like percent of the entire territory so petition, the board shall order an election and, unless at said election the qualified electors of each of the said component parts counted separately and a majority of the entire proposed new district counted in the aggregate shall favor the proposal, it shall not be allowed and the proposal shall be ordered rejected.