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100% / 20 = 5
P.Anna 9*5 = 45%
P.Barbara 7*5 = 35%
P.Cecylia 4*5 = 20%
20->100%
Anna
20->100%
9-> x
obliczasz z proporcji
x= 45%
Barbara
20->100%
7->x
x=35%
Cecylia
20->100%
4->x
x=20%
9/20=45%
7/20=35%
4/20=20%