For a project, it takes 15 days for Team A to do it alone, and Team B can complete the project (1/2) in 5 days alone. Now the two teams cooperate for 2 days, and the rest is done by Team A alone. How many days did it take to complete?
一项工程，甲队单独做要15天，乙队单独做5天能完成这项工程的(1/2)，现在先有两队合作2天，剩下的由甲队单独做，还要几天才完成？
<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 5</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/15) + (1/10)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(2/3) / (1/15)</gadget>
<output>10</output>

<result>10</result>