A, B, and C work together to complete a project in 6 days, A and B need 12 days to complete it, and C alone takes how many days to complete it?
甲、乙、丙三人合作一个项目需要6天完成，甲、乙两人做需要12天完成，丙一个人做需要几天完成？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(1/6) - (1/12)</gadget>
<output>1/12 = around 0.083333</output>

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

<result>12</result>