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4,6=10%
100%-30%=70%
0,5*70%=35%
dziewczyny- 30%+35%=65%
chłopcy- 35%
dz-6,5*4,6=29,9
chł-3,5*4,6=16,1
dziewczyny 30%x= x+0.3x / 20+0.3*20=20+6=26
x+x+0.3x= 46
2.3x=46
x=20