<human>:  After complaints from the residents of Tatoosh about the number of cats on the island, the wildlife service carried out a relocation mission that saw the number of cats on the island drastically reduced. On the first relocation mission, 600 cats were relocated from the island to a neighboring island. On the second mission, half of the remaining cats were relocated to a rescue center inland. If the number of cats originally on the island was 1800, how many cats remained on the island after the rescue mission?
<bot>: How many cats remained on the island after the first mission? ** After the first mission, the number of cats remaining on the island was 1800-600 = <<1800-600=1200>>1200.
How many cats were relocated on the second mission? ** If half of the remaining cats on the island were relocated to a rescue center inland, the number of cats taken by the wildlife service on the second mission is 1200/2 = <<1200/2=600>>600 cats.
How many cats remained on the island after the second mission? ** The number of cats remaining on the island is 1200-600 = <<1200-600=600>>600
#### 600