72 cm iron wire surrounds a cuboid frame with a length, width and height ratio of 3:2:1. What is the volume of the cuboid (neglecting the joints)?
把一根72厘米的铁丝，围成长宽高为3：2：1的长方体框架，围成的长方体的体积是多少立方厘米(接头处忽略不计)？
<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<gadget id="calculator">3 + 2 + 1</gadget>
<output>6</output>

<gadget id="calculator">3 / 6</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 / 6</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">18 * (1/3)</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">18 * (1/2) * 6 * 18 * (1/6)</gadget>
<output>162</output>

<result>162</result>