The Kent County Levy Court shall appoint the persons to conduct the election. The polls shall remain open at least 4 hours. All residents of the County, 18 years of age or older, shall be entitled to vote at such election if the borrowing is for a countywide library. If the borrowing is for a district library only the residents of the library district, 18 years of age or older, shall be entitled to vote. The voting shall be by ballot on which shall be written or printed the words “for the resolution in aid of the library” or “against the resolution in aid of the library.”