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p.Anna: 9/20*100%=45%
p.Barbara: 7/20 *100%=35 %
p. Cecylia: 4/20 *100%= 20%
pzdr ;)
Anna 9x
Barbara 7x
Cecylia 4x
suma: 9x+7x+4x=20x
Anna 9x:20x*100%=45%
Barbara 7x:20x*100%=35%
Cecylia 4x:20x*100%=20%