To build a road, team A completed it alone in 10 days, and team B completed it in 15 days. After team A and B jointly repaired it for several days, A asked for leave due to business, and B continued to work. It took 9 days to complete the task. How many days does Team A ask for leave?
修一条路，甲队独修10天完成，乙队独修15天完成，甲乙两队合修了若干天后，甲因事请假，乙继续做．完成任务共用了9天．甲队请假多少天？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 9</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">(2/5) / (1/10)</gadget>
<output>4</output>

<gadget id="calculator">9 - 4</gadget>
<output>5</output>

<result>5</result>