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12a=192
a=16
panjang: 4a=4(16)=64
lebar: 3a=3(16)=48
tinggi: 5a=5(16)=80
rusuk pendek ada 4
rusuk tinggi ada 4
4x*4+3x*4+5x*4=192 cm
16x+12x+20x=192 cm
48x=192 cm
x=4cm
jd panjang 4x =16cm
lebar 3x=12cm
tinggi 5x=20cm