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

### Instruction:
 艾米莉亚需要42盒浆果来做浆果馅饼。她已经有2盒草莓和7盒蓝莓在她的橱柜里。她决定去超市买更多盒子。艾米莉亚应该买多少盒浆果？


### Response:
 她之前已经有2盒 + 7盒 = <<2+7=9>>9盒浆果。
艾米莉亚需要买42盒 - 9盒 = <<42-9=33>>33盒浆果。