There is a project that team A alone can complete in 12 days, and team A and team B cooperate to complete it in 8 days. If Team A works alone for a certain number of days, Team B then finishes it alone, and the two engineering teams share 18 days, how many days does Team B work.
有一项工程，甲队单独做12天完成，甲队和乙队合作8天完成．若甲队单独做若干天之后，乙队接着单独做完，且两个工程队共用18天，则乙队做了多少天．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) * 18</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) - 1</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">(1/8) - (1/12)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(1/12) - (1/24)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">(1/2) / (1/24)</gadget>
<output>12</output>

<result>12</result>