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Panjang kerangka balok = 180 cm
perbandingan panjang : lebar : tinggi = 4 : 3 : 2
faktor pengali x ?
maka :
Jumlh panjang = 4 x (p+l+t)
180 = 4 x (4x + 3x + 2x)
180 = 4 x 9x
180 = 36x
x = 180/36
x = 5 cm
jdi :
panjang = 4x5 = 20 cm
lebar = 3 x 5 = 15 cm
tinggi = 2 x 5 = 10 cm
V = p x l x t
= 20 x 15 x 10
= 3.000 cm³