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

### Instruction:
 曼迪为她的网球队买了3包黑色衬衫和3包黄色衬衫。黑色衬衫每包有5件，黄色衬衫每包有2件。曼迪总共买了多少件衬衫？


### Response:
 黑色衬衫的数量是3 × 5 = <<3*5=15>>15件。
黄色衬衫的数量是3 × 2 = <<3*2=6>>6件。
曼迪总共买了15 + 6 = <<15+6=21>>21件衬衫。