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

### Instruction:
 Onum Lake比Boast Pool多25条鳟鱼。Boast Pool有75条鱼。Riddle Pond的鱼数量是Onum Lake的一半。这三个水域的鱼的平均数量是多少？


### Response:
 Onum Lake有25+75=<<25+75=100>>100条鱼。
Riddle Pond有100/2= <<100/2=50>>50条鱼。
这三个水域的鱼的平均数量是(25+75+50)/3= <<(25+75+50)/3=50>>50条鱼。