The side length of a cuboid is 72 cm, and the ratio of length, width and height is 3:2:1. What is the surface area of this cuboid?
一个长方体的棱长和72厘米，长、宽和高的比是3：2：1，这个长方体的表面积是多少？
<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">18 * (1/2) * 6</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">6 * 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>