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56 + 16 = 72
72 - 100 %
56 - x
x = 77,78 % żelaza
100 - 77,78 = 22,22 % tlenu
2:6
56×2 + 16×6 = 208
208 - 100 %
112 - x
x = 53,85 % żelaza
100 - 53,85 = 46,15 % tlenu