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z tego 12 kul białych musi stanowić 30%
a x kul czarnych musi stanowić 70%
12 = 30%
X = 70%
(70*12) / 30 = 28
28 to liczba 100%
odejmujemy to co mamy
28 - 12 białych - 3 czarne = 13
odp.
musimy dodać 13 kul czarych
pozdrawiam i czekam na NAJ ;)