It takes 20 days for Team A and Team B to complete a project. Team A has to complete other work first, so it is ten days late. As a result, it takes 25 days for the project to be completed. How many days does it take for Team A to complete the task alone?
一项工程，甲乙两队合作需要20天完成，甲队先要完成别的工作，所以迟来了十天，结果这些工程工作了25天才完成，问甲队单独做需要几天完成任务？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">25 - 10</gadget>
<output>15</output>

<gadget id="calculator">(1/20) * 15</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(1/4) / 10</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">(1/20) - (1/40)</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">1 / (1/40)</gadget>
<output>40</output>

<result>40</result>