At a conference, 94 salespeople are dicussing effective strategies to expand a customer base. The dicussion had been divided into 20 subtopics, and each subtopic will be discussed by group of either 4 or 6 salespeople. How many of the subtopics will be discussed by a group of 6 salespeople?

In a collage art class, 76 students are painting a mural on one wall of the campus amphitheater. The wall has been divided into 23 sections, and each section will be painted by a group of either 2 or 4 students. How many more sections will be painted by a group of 4 students than by a group of 2 students?