###Human: 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?, ### Assistant: The workers produce a combined total of 3 workers * 4 hours = 12 chairs every hour.
After 6 hours, they have therefore produced 12 * 6 = 72 chairs.
Adding the additional chair means the total amount of chairs produced is 72 + 1 = 73 chairs. 
 So the answer is :  73