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

### Instruction:
 拉克森夫人收获了80个甜薯。她把其中20个卖给了亚当斯夫人，15个卖给了莱农先生。还有多少个甜薯没有卖出去？


### Response:
 拉克森夫人卖出了20 + 15 = <<20+15=35>>35个甜薯。
因此，还有80 - 35 = <<80-35=45>>45个甜薯没有卖出去。