Final answer:
To find the ratio of adults to boys, use the ratios given. To find the fraction of girls, calculate the proportion of girls to the total number of people at the stadium.
Step-by-step explanation:
To find the ratio of the number of adults to the number of boys, we need to relate the ratios given in the problem. Let's assume that the number of adults is 11x and the number of children is 4x. Similarly, the number of boys can be represented as 5y and the number of girls as y, where y is a common factor. Thus, the ratio of adults to boys is (11x) / (5y).
To determine the fraction of people who were girls, we need to calculate the proportion of girls to the total number of people at the stadium. The total number of people can be calculated as (11x + 4x) + (5y + y) = 15x + 6y. The fraction of girls is then y / (15x + 6y).
Learn more about Ratio, Proportion, Fraction