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

### Instruction:
 虎鲨有180颗牙齿。锤头鲨的牙齿数量是虎鲨的1/6。大白鲨的牙齿数量是虎鲨和锤头鲨牙齿数量之和的两倍。大白鲨有多少颗牙齿？


### Response:
 锤头鲨：180/6=30颗牙齿
大白鲨：2(180+30)=420颗牙齿