If A works alone, it will take 18 days to complete a project; if A and B cooperate, the entire project (5/6) can be completed in 6 days. If B works alone, how many days will it take to complete?
一项工程，如果甲单独做，需要18天完成；如果甲、乙两队合作，6天就能完成全部工程的(5/6)，如果乙队单独做，需要多少天完成？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">(5/6) / 6</gadget>
<output>5/36 = around 0.138889</output>

<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(5/36) - (1/18)</gadget>
<output>1/12 = around 0.083333</output>

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

<result>12</result>