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

### Instruction:
 保罗和他的妹妹宝拉去饼干店买饼干。宝拉比保罗少买了3块饼干，而保罗买了45块饼干。他们一共有多少块饼干？


### Response:
 宝拉买了45块饼干 - 3块饼干 = <<45-3=42>>42块饼干。
总共，他们有45块饼干 + 42块饼干 = <<45+42=87>>87块饼干。