In a school, 315 girls participate in at least one sport, with 100 in fall, 150 in winter, and 200 in spring sports. A Venn diagram is suggested to visualize the relationships among the groups. The formula for calculating the total number of participants across overlapping sets is provided, which includes intersections of the sets. It is noted that while specific intersections are not given, the total for girls playing exactly two sports is known to be 75. The goal is to determine how many girls play all three sports.