A cuboid has a length of 20 cm, a width of 15 cm, and a height of 30 cm. What is the total length of the sides of this cuboid?
一个长方体长20厘米、宽15厘米、高30厘米，这个长方体的总棱长是多少？
<gadget id="calculator">20 + 15 + 30</gadget>
<output>65</output>

<gadget id="calculator">65 * 4</gadget>
<output>260</output>

<result>260</result>