The sum of the edge lengths of a cuboid is 72cm, and the ratio of length, width and height is 3:2:1. Find the volume of the cuboid?
一个长方体的棱长总和是72cm，长宽高的比是3：2：1，求长方体的体积？
<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>