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The first volume of mathematics in the sixth grade of primary school
The ratio of girls to boys is 1:4.

Girls 1, boys 4, * * 5.

55% of the total number of people: 5x55% = 2.75 (copies)

Each serving: 100(4-2.75)= 80 (person)

Participate in this competition * * *: 80x5=400 (person)

The ratio of girls to boys is 1:4.

Boys account for 4/( 1+4)=4/5 of the participants.

Total number of people: 100(4/5-55%)= 400 (people)