A project can be completed in 8 days by A alone, 10 days by B alone, 12 days by C alone, how many days will it take for A and B to complete it together after 2 days and C alone?
一项工程，甲单独做8天完成，乙单独做10天完成，丙单独做12天完成，甲乙合做2天后再由丙单独做还要几天完成？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/40) * 2</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">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(11/20) / (1/12)</gadget>
<output>33/5 = around 6.6</output>

<result>33/5 = around 6.6</result>