Originally, the number of girls accounted for 1/3 of the total number, and the total number of students in the whole group was 3, with girls 1 and boys 3- 1 = 2. The number of girls is 65438+ 0/2 of the number of boys.
Now the number of girls accounts for 4/9 of the total number, and now the total number is 9,4 girls, 9-4=5 boys and 4/5 girls.
Number of boys =6/(4/5- 1/2)=20.
Number of girls =20*4/5= 16.
I hope it helps you!