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50% - 6
____________
100% - 36 /:2
50% - 18 /:2
25 % - 9
____________
100% - 80 /:10
10% - 8
____________
100% - 25 /:5
20% - 5
Liczba 9 stanowi 25% liczby 36.
Liczba 8 stanowi 10% liczby 80.
Liczba 5 stanowi 20% liczby 25.