It is known that A and B collaborate on a project. A alone will complete it in 25 days, and B alone will complete it in 20 days. After A and B cooperate for 5 days, A has another task, and B will complete it in a few days alone?
已知甲乙合作一项工程，甲单独做25天完成，乙单独做20天完成，甲乙合作5天后，甲另有任务，乙单独再做几天完成？
<gadget id="calculator">1 / 25</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/25) + (1/20)</gadget>
<output>9/100 = around 0.09</output>

<gadget id="calculator">(9/100) * 5</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">(11/20) / (1/20)</gadget>
<output>11</output>

<result>11</result>