The class bought a 36m long ribbon, and used (1/6) of it to tie a bow, and (1/3) of it to weave a Chinese knot. How long is the ribbon left?
班级买来36m长的彩带，用它的(1/6)扎蝴蝶结，它的(1/3)编中国结，求还剩多长的彩带？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">36 * (1/6)</gadget>
<output>6</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">36 * (1/3)</gadget>
<output>12</output>

<gadget id="calculator">36 - 6 - 12</gadget>
<output>18</output>

<result>18</result>