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isi drum:25 liter x 4/5= 20 liter = 20dm3
Vbak: p.l.t = 40cm x 25cm xt
20dm3 = 1000cm2 xt
t: 20dm / 1000cm
:20000/1000
: 20cm
pembuktian jika t: 20cm
Vbak: 40x25x20
:20000cm3
:20dm3