A total of 22 girls joined the ban during the school year because during the beginning of the school year girls consisted of 7/12 of the 72 students and when multiplied youll get 42 students. At the end of the year the bous were 3/7 of the wole band so to get 1/7 youll want to divide the number of male students by three to get 16 and then multiply it by 4 because birls cobsisted of 4/7 of the club at the end of tge year. What youll get is 64. Now you want to find the differences of the amount of girls at the end of the year from the ones in the beginning to tge year. So that will be 64 - 42 and youll get 22 students.
