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p*l*t + p*l*t
50*25*20 + 20*25*10
25000 + 5000
30000 cm3
V bangun 1 : p.l.t
: 30.25.20 = 15.000cm3
V bangun 2 : p.l.t
: 20.25.30 = 15.000cm3
V total = 15.000 + 15.000 = 30.000cm3