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

### Instruction:
 莫娜带了20块饼干来班上分享。茉莉比莫娜少带了5块饼干。瑞秋比茉莉多带了10块饼干。莫娜、茉莉和瑞秋一共带了多少块饼干来班上分享？


### Response:
 茉莉带了20块饼干 - 5块饼干 = <<20-5=15>>15块饼干来班上。
瑞秋带了15块饼干 + 10块饼干 = <<15+10=25>>25块饼干来班上。
莫娜、茉莉和瑞秋一共带了20块饼干 + 15块饼干 + 25块饼干 = <<20+15+25=60>>60块饼干。