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rusuk(panjang) jumlahnya 4 maka butuh 40 cm
rusuk(tinggi) jumlahnya 4 maka butuh 80 cm
lebar...??
==> 4rusuk(lebar)=180- (40 +80)
=180 - 120
= 60 cm
maka lebar balok adalah 60 / 4 = 15 cm
180 = (10×4) + 4l + (20×4)
180 = 40+4l+80
180 = 120+4l
180 - 120 = 4l
4l = 60
l = 60/4
l = 15 cm