No election in any unit referred to in RCW 66.40.010, 66.40.020, 66.40.040, 66.40.100, 66.40.110, 66.40.120 and 66.40.140, upon the question of whether the sale of liquor shall be permitted within the boundaries of such unit shall be held at the same time as an election is held in the same unit upon the question of whether the sale of liquor under the provisions of RCW 66.40.030 shall be permitted. In the event valid and sufficient petitions are filed which would otherwise place both questions on the same ballot that question upon which the petition was filed with the county auditor first shall be placed on the ballot to the exclusion of the other.