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

### Instruction:
There are 3 workers producing chairs in a furniture factory. Each of them produces 4 chairs an hour. As a group, they produce an additional chair every 6 hours. In total, how many chairs have been produced after 6 hours?

### Response:
 ในหนึ่งชั่วโมงพวกเขาผลิต 4*3 = <<4*3=12>>12 เก้าอี้
ใน 6 ชั่วโมงพวกเขาผลิต 6*12 = <<6*12=72>>72 เก้าอี้