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6m:20cm=30
5m:20cm=25
30*25=750
Odp: potrzeba 750 kafelek
600cm:20cm=30
500cm:20cm=25
30*25=750
6m x 5m = 30m2= 30000000mm2
Powierzchnia kafelka
200mm x 200mm = 40000mm2
30000000mm2 / 40000mm2 = 750
Odp. Trzeba kupić 750 kafelków