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b = 60cm = 6dm
c = 30cm = 3dm
V = a*b*c
V = 4*6*3
V = 72 (dm3)
1 dm3 = 1 litr
5/6 * 72 = 60
60 + 6,5 = 66,5
Odp. Akwarium wypełnione wodą waży 66,5 kg.