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

### Instruction:
 Cheryl午饭后吃了7颗M&M巧克力豆。晚饭后她又吃了5颗M&M巧克力豆，并把一些给了她妹妹。如果Cheryl一开始有25颗M&M巧克力豆，她给了她妹妹多少颗？


### Response:
 Cheryl吃了7 + 5 = <<7+5=12>>12颗M&M巧克力豆。
她给了她妹妹25 - 12 = <<25-12=13>>13颗M&M巧克力豆。