A batch of parts can be completed in 8 days by cooperation between A and B, A can complete it in 12 days alone, and B can complete it in how many days alone.
一批零件，甲、乙合作8天可以完成，甲单独做12天可以完成，乙单独做多少天可以完成．
<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">(1/8) - (1/12)</gadget>
<output>1/24 = around 0.041667</output>

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

<result>24</result>