Jawabanmu

2014-01-10T19:08:37+07:00
Diketahui Pu = 1,2 kg/m^3

V = 4 . 5 . 3 = 60 m^3

P = m / V
m = P . V
m = 1,2 kg/m^3 . 60 m^3
m = 72 kg