65 ILCS 5/2-3-12

The questions proposed in these petitions may be submitted to vote at the same election. In this event, the vote on each question submitted shall be counted and given effect as if it were the only question voted upon. If 2 or more petitions are presented embracing in part the same territory, the one first presented shall be submitted alone to a vote. If the one first presented is carried, the other petitions shall not be submitted. If the one first presented is voted down, the petition next presented shall be submitted, and so on, until one has been carried, or all have been voted down.