For a project, teams A and B can complete the task in 12 days. Now team A has done it for 3 days, and team B has done it for 1 day. They have completed the entire project (3/20). If team B works alone, how many Can the whole project be completed in one day?
一项工程，甲、乙两队合做12天可以完成任务，现在甲队做了3天，乙队做了1天，共完成全部工程的(3/20)，如果乙队单独做，几天可以完成全部工程？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) - (1/12)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">(1/15) / 2</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/12) - (1/30)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / (1/20)</gadget>
<output>20</output>

<result>20</result>