Master Li welded a 12-meter-long iron wire into a cuboid. The ratio of length, width and height is 3:2:1. What is the volume of this cuboid in cubic meters?
李师傅用12米长的铁丝焊接成一个长方体，长、宽、高的比是3：2：1，这个长方体的体积是多少立方米．
<gadget id="calculator">12 / 4</gadget>
<output>3</output>

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

<gadget id="calculator">12 / 4 / 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">3 * (1/3)</gadget>
<output>1</output>

<gadget id="calculator">(1/3) / 6</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">3 * (1/18)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 * (1/2) * 3 * (1/3) * 3 * (1/6)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>