A cake box is 20 cm long, 16 cm wide, and 10 cm high. It is wrapped with a ribbon, and the knot is 12 cm. Find the length of the ribbon.
一个蛋糕盒子长20厘米，宽16厘米，高10厘米，用彩带包装一下，打结处12厘米，求彩带的长度．
<result>144</result>