As you may know, I ‘m teacher assistant at FIUBA. some weeks ago we asked the students to form groups. According to the number of students and teachers, we needed 6 groups of 8 members each. But…the students presented 7 groups, 3 of them with 8 members each, and other 4 groups of 6 members each. In a first attempt we try to dissolved one group and reorganized its members to have 3 groups, but after a while we decided to call the all the members of these 4 groups and we told them: “we have 3 groups of 8 members each and we can handle only 3 more groups, so we need you to form 3 groups as you like”. Some minutes later the had solved the problem.