Bila panjang, lebar, dan tinggi balok mempunyai rasio 6: 5 : 4 dan luas permukaan 33.300cm2. hitunglah ukuran panjang, lebar, dan tingginya?
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33.300 = 2(6x5x + 6x4x + 5x4x)
16.650 = 30x^2 + 24x^2 + 20x^2
16.650 = 74x^2
x^2 = 16.650/74
x^2 = 225
x = 15
maka
p=6x
p= 90
l=5x
l= 75
t =4x
t = 60