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Vx = 5/5-1/5= 4/5
Vb = Vc+Vx = 1/5+4/5=1
ρc = 1000 kg/m³
ρb.Vb = ρc.Vc
ρb.1 = 1000.1/5
ρb = 200
jadi ρ kayu sama dengan 200 kg/m³ (e)