The sum of the lengths of the sides of a cuboid is 120 cm, what is the sum of the lengths of the three sides that intersect at a vertex
一个长方体的棱长之和是120厘米，相交于一个顶点的三条棱的长度和是多少
<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<result>30</result>