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dz - dziewczyny
ch = ch/(ch+dz) * 100% = 40%
dz = 100% - ch = 60%
100%-40%=60% procent dziewcząt w klasie
chłopcy to 10 z 25, 10/25 * 100% = 40%
dziewczyny to 15 z 25, 15/25 * 100% = 60%