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⅝x=rzepki krzepkie
2% z ⅝x=0,02×⅝x=0,0125x to 2% wielkich rzepek z krzepkich rzepek
x=100%
0,0125x=z %
z=0,0125×100:1
z=1,25%
odp. wielkie i krzepkie rzepki to 1,25% wszystkich rzepek