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0,4*40=16
[(8+16)*100%]/80=2400%/80=30%
40% z 40 osób=0,4×40=16 kobiet
razem osób=40+40=80
razem kobiet=8+16=24
80=100%
24=x%
x=24×100:80
x=30%
odb. kobiety stanowią 30%
40*40%=16
16+8/40+40=24/80
24/80*100%=30%