The sum of the lengths of the sides of a cuboid is 72 centimeters, what is the sum of the lengths of the three sides starting from a vertex in centimeters?
一个长方体的棱长总和是72厘米，从一个顶点出发的三条棱的棱长和是多少厘米．
<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<result>18</result>