During the summer vacation, Xiaohong helped her mother cut a batch of window grilles. The mother and daughter cut this batch of window grilles in 6 days (1/3), so how many days will it take for the two to cut this batch of window grilles together?
暑假里小红帮妈妈剪一批窗花，母女两人6天剪了这批窗花的(1/3)，那么两人一起剪完这批窗花一共需要几天的时间？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/3) / 6</gadget>
<output>1/18 = around 0.055556</output>

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

<result>18</result>