A project was completed by team A in 15 days alone, and team B in 10 days alone. Now A worked for 3 days and another task was transferred, and B continued to complete the project. How many days did it take to complete the project?
一项工程，甲队单干15天完成，乙队单干10天完成，现甲先干了3天另有任务调走，乙接着干完工程，完成这项工程共用了多少天？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/15) * 3</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) / (1/10)</gadget>
<output>8</output>

<gadget id="calculator">8 + 3</gadget>
<output>11</output>

<result>11</result>