A cuboid frame is surrounded by 36 cm long iron wire. The ratio of the length, width and height of this cuboid is 3:2:1. What is its volume?
用36厘米长的铁丝围成一个长方体框架，这个长方体长、宽、高的比是3：2：1，它体积是多少？
<gadget id="calculator">3 + 2 + 1</gadget>
<output>6</output>

<gadget id="calculator">36 / 4 / 6</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) * 3 * (3/2) * 2 * (3/2) * 1</gadget>
<output>81/4 = around 20.25</output>

<result>81/4 = around 20.25</result>