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

### Instruction:
 沃森老师的班上有14个幼儿园生，24个一年级生和一些二年级生。总共有42个学生。沃森老师的班上有多少个二年级生？


### Response:
 沃森老师的班上有14+24 = <<14+24=38>>38个幼儿园生和一年级生。
沃森老师的班上有42-38 = <<42-38=4>>4个二年级生。