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1 = 1,3
15 000 razy 1,3 = 19,5 tony
b=30m
c=10m
v=50x30x10=15000m³
15000x1,3=19500kg
19500kg=19,5 t
V=50m*30m*10m=15000m³
15000m³*1.3kg=19500kg
19500kg=19.5 tony
Odp. Powietrze waży 19.5 tony. Pozdrawiam:)