A road can be completed in 18 days by A alone, and by B in 12 days. After a few days of joint practice between teams A and B, team B was transferred away, and team A continued to practice for 3 days to complete the task. How many days did team B practice?
一条公路，甲独修需18天完成，乙独修需12天完成．甲、乙两队合修若干天后，乙队调走，甲队继续修3天完成任务，乙队修了多少天？
<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(1/18) * 3</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/18) + (1/12)</gadget>
<output>5/36 = around 0.138889</output>

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

<result>6</result>