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volume kaleng berisi pasir = 1/4 x 10800 = 2700 cm³
volume kaleng kosong = 10800 -2700 =8100 cm³
p: 20 cm
l: 18 cm
t: 30 cm
dit: volume bagian kaleng yang kosong setelah kaleng diisi pasir sebanyak 1/4 bagian
jwb:
v=p.l.t
=20.18.30
10800 cm3
4/4 - 1/4 = 3/4
10800 x 3/4 = 8100 cm3