The sum of the lengths of the sides of a cuboid is 80 cm, what is the sum of the lengths of the three sides starting from the same vertex in cm?
一个长方体的棱长总和是80cm，从同一顶点出发的三条棱的长度之和是多少cm．
<gadget id="calculator">80 / 4</gadget>
<output>20</output>

<result>20</result>