The sum of the lengths of the sides of a cuboid is 60 cm, what is the sum of the lengths of the three sides drawn from a vertex?
一个长方体的棱长之和是60厘米，从一个顶点引出的三条棱长的和是多少？
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>