To do a project, teams A and B cooperate and finish it in 10 days. Team A works for 3 days, and team B continues for 2 days. A total of 1/4 of the work is completed. How many days does it take for team A to do it alone?
做一项工程，甲、乙两队合作，10天完成，甲队做了3天后乙队接着做2天，共完成全部工作的(1/4)，甲队单独做需要多少天完成？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 2</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

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

<result>20</result>