We have 18 meters of ribbon, and we used (1/3) of the ribbon to tie the gift box and (1/2) of the ribbon to tie the bow, how many meters of ribbon are left?
我们有18米彩带，用了彩带中的(1/3)捆扎礼品盒，又用了彩带中的(1/2)扎蝴蝶结，还剩多少米彩带？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/3) - (1/2)</gadget>
<output>1/6 = around 0.166667</output>

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

<result>3</result>