The sum of the lengths of the sides of a cuboid is 108dm, the length is 6 times the height, and the width is 2 times the height. What is the length?
长方体棱长总和是108dm，长是高的6倍，宽是高的2倍，长是多少．
<gadget id="calculator">1 + 2 + 6</gadget>
<output>9</output>

<gadget id="calculator">108 / 4 / 9</gadget>
<output>3</output>

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

<result>18</result>