Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
There are chickens roaming the chicken farm. The roosters outnumber the hens 2 to 1. If there are 9,000 chickens on the chicken farm, how many roosters are there?

### Response:
There are 2 roosters for every 1 hen, so there are 2 roosters/hen * 9,000 hens = <<2*9000=18000>>18,000 roosters.
#### 18000

