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

### Instruction:
 上周，Keiko发送了111条短信。这周，她发送的短信数量是上周发送数量的两倍减去50。Keiko上周和这周一共发送了多少条短信？


### Response:
 上周 = 111
这周 = (2 * 111) - 50 = <<(2*111)-50=172>>172
111 + 172 = <<111+172=283>>283
Keiko上周和这周一共发送了283条短信。