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V = 35 m³
21% - ilość tlenu w powietrzu
Vp = 35 × 21% = 7,35 m³
b-3,5 m
c-2,5m
V powietrza = 4 m * 3,5 m * 2,5 m = 35 m₃
100%-35 m³
21% - x
x=21% *35m³/100%=7,35m³