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5gr/ = massa/ (3x4x5)
5 = massa / 60
massa = 5 x 60
massa = 300 gr
= 3 x 5 x 4
= 60 cm³
ρ = 5 gr/cm³
ρ = m / V
m = ρV
= 5 gr/cm³ . 60 cm³
= 300 gram
= 0,3 kg