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60cm=6dm=b
40cm=4dm=c
⁵/₆ z 3dm=2,5dm
v=abc=3×6×2,5=45dm³
1dm³=1litr
45dm³=45 litrów=45kg
45kg+6,5kg=51,5kg
odp. waży 51,5kg
72000cm3=72dm3 <--zamiana jednostek
6,5+72=78,5kg <--puste akwarium + woda