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12 prostokątow
7 zamalowanych
odp. zamalowano 7/12 prostokąta
2)
25 kwadracikow
zamalowano 4 kwadraciki
25 - 100 %
4 - x %
x= 100 * 4 : 25 = 400 : 25 = 16
x = 16 %
odp. D. 16 %