Sanjiayi hotel

What does this mean? There's a problem here. At what age should people do this problem? What do you mean by the best deal? I think it's a child of 12. Book three triple rooms at 388 with nine children. Then there are three children and a teacher left, a total of four people. For the remaining three children, I think it's best to be a triple room and a double room forever.

It's three people plus one, and one person picks up 556.

What I have left is 288×2 rooms, which need 576.

It is said that the most cost-effective thing is that 12 children make four triple rooms and one teacher makes a single room.