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

### Instruction:
 玛丽莎有4.5英尺的丝带，她想用来系一些盒子。如果玛丽莎用0.7英尺的丝带来系每个盒子，那么她一共系了多少个盒子？


### Response:
 玛丽莎一共用了4.5 - 1 = <<4.5-1=3.5>>3.5英尺的丝带来系盒子。
因此，她一共系了3.5/0.7 = <<3.5/0.7=5>>5个盒子。