It takes 8 days for A and B to complete a job together, 12 days for B to complete alone, and how many days for A to complete alone?
一件工作甲、乙合作需要8天完成，乙单独做需要12天完成，甲单独做需要几天完成？
<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">(1/8) - (1/12)</gadget>
<output>1/24 = around 0.041667</output>

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

<result>24</result>