let xxx be the number of girls, then x+21x+21x+21 is the number of boys
x+x+21=48x+x+21=48x+x+21=48
2x=272x=272x=27
x=13.5x=13.5x=13.5
mathematical answer 13.513.513.5 , but since there should be an integer. I think there are 131313 girls in the class
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