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

### Instruction:
 丹妮尔的公寓有6个房间。海蒂的公寓有丹妮尔公寓的3倍房间数。格兰特的公寓有海蒂公寓的1/9房间数。格兰特的公寓有多少房间？


### Response:
 海蒂的公寓有3 * 6 = <<3*6=18>>18个房间。
格兰特的公寓有18 / 9 = <<18/9=2>>2个房间。