The sum of the lengths of the sides of a cuboid is 72 cm, what is the sum of the three sides intersecting at a vertex in cm?
一个长方体的棱长总和是72cm，相交于一个顶点的三条棱的总和是多少cm．
<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<result>18</result>