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

### Instruction:
The kindergartners each need to bring one mini tissue box to class for the school year.  There are three kindergartner groups with 9, 10, and 11 students respectively.  Each mini tissue box contains 40 tissues.  How many tissues do the kindergartner groups bring together?

### Response:
 จำนวนนักเรียนทั้งหมดคือ 9+10+11=<<9+10+11=30>>30 คน
ดังนั้นพวกเขานำมาทั้งหมด 30*40=<<30*40=1200>>1200 ใบ