A 72 decimeter long iron wire is welded into a cuboid frame, the ratio of length, width and height is 3:2:1, find the area of the cuboid.
一根长72分米的铁丝焊成一个长方体框架，长、宽、高的比是3：2：1，求长方体的面积．
<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 * (1/2) * 18 * (1/3)</gadget>
<output>54</output>

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

<gadget id="calculator">18 * (1/2) * 18 * (1/6)</gadget>
<output>27</output>

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

<gadget id="calculator">54 + 27 + 18</gadget>
<output>99</output>

<gadget id="calculator">99 * 2</gadget>
<output>198</output>

<result>198</result>