If A and B work together to complete a project in 8 days, B and C work together to complete it in 9 days, and C and A work together to complete it in 18 days, how much will it take for C to do it alone? sky.
一项工程，甲、乙两人合做8天完成，乙、丙两人合做9天完成，丙、甲两人合做18天完成，那么丙一个人来做，完成这项工作需要多少天．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / 18</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">(1/8) + (1/9) + (1/18)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">(7/24) / 2</gadget>
<output>7/48 = around 0.145833</output>

<gadget id="calculator">(7/48) - (1/8)</gadget>
<output>1/48 = around 0.020833</output>

<gadget id="calculator">1 / (1/48)</gadget>
<output>48</output>

<result>48</result>