6 sofas =6 long+12.

6 long =6 people

12 single =3 people

***9 people

2)

What I want to ask is the maximum number of sets, otherwise I will only do single person sofa, and there will only be 0 sets in the end.

What is the maximum number of solutions below?

A group of three workers, one of whom is single person sofa (***4 single person sofa) and the other two are couches (***2 couches).

Three workers can make two sets of sofas a day.

30 workers is 20 sets.