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

### Instruction:
John buys 2 packs of index cards for all his students.  He has 6 classes and 30 students in each class.  How many packs did he buy?

### Response:
 จอห์นมีนักเรียนทั้งหมด 6 x 30 = <<6*30=180>>180 คน
ดังนั้นเขาซื้อแพ็คทั้งหมด 180 x 2 = <<180*2=360>>360 แพ็ค