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l = 3n
t = 2n
jml panjang rusuk balok = 4 (p + l + t)
72 = 4 (4n + 3n + 2n)
72 = 4 (9n)
72 = 36n
n = 72/36
n = 2
p = 4n = 4.2 = 8
l = 3n = 3.2 = 6
t = 2n = 2.2 = 4
volume = p.l.t
= 8.6.4
= 192 cm³