Grades 9-10 Video Solutions 2021-video 2021 9-10/16

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The problem involves five teams with either only boys or girls, having 9, 15, 17, 19, and 21 members each, totaling 81 members. After the first team starts, the remaining girls are three times the number of remaining boys. This condition is expressed as 1/4 of the remaining members being boys and 3/4 being girls. Calculating possible team start sizes and verifying which matches the given condition, it’s determined that the first team, which already started, had 21 members. Hence, the team that went first consisted of 21 members.