A project is completed by teams A and B after 3 days of cooperation and then completed by team B alone in (9/2) days. This project will be completed by A alone in 12 days. If it is done by B alone, how many days will it take?
一项工程由甲、乙两队合作3天后再由乙队用(9/2)天单独做完，这项工程由甲单独做要12天，如果由乙单独做需要多少天？
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/12) * 3</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<gadget id="calculator">3 + (9/2)</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">(3/4) / (15/2)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>