A project can be completed in 20 days by team A alone, 30 days by team B alone, and 60 days by team C alone. Now A, B and C cooperate in this work. During the work, A has a rest 2 days, B rested for 3 days, C did not rest, and finally finished the work. How many days did it take to complete this work?
一项工程，甲队独做需要20天完成，乙队独做需要30天完成，丙单独做需要60天完成，现在由甲、乙、丙合作这项工作，在工作过程中，甲休息了2天，乙休息了3天，丙没有休息，最后把工作完成了．问完成这项工作一共用了多少天？
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 2</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 30</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">(1/30) * 3</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 + (1/10) + (1/10)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/20) + (1/30) + (1/60)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(6/5) / (1/10)</gadget>
<output>12</output>

<result>12</result>