A cuboid, the sum of the lengths of all the sides is 48 cm, what is the sum of the lengths of the three sides that intersect at a vertex
一个长方体，所有的棱长之和是48厘米，相交于一个顶点的三条棱的长度的和是多少
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>