A project is completed in 8 days by the cooperation of A and B, 6 days by the cooperation of B and C, and 12 days by the cooperation of C and D, so how many days can it be completed by the cooperation of A and D?
一件工程，甲乙合作8天完成，乙丙合作6天完成，丙丁合作12天完成，那么甲丁合作多少天可以完成．
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

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

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

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

<gadget id="calculator">(1/8) + (-1/12)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">1 / (1/24)</gadget>
<output>24</output>

<result>24</result>