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

### Instruction:
 一个小时后，Addison山的温度将减少到当前温度的3/4。如果山的当前温度是84度，温度将减少多少度？


### Response:
 一个小时后，Addison山的温度将减少到当前温度的3/4，意味着温度将减少到3/4 * 84 = 63度。
温度减少了84 - 63 = <<84-63=21>>21度。