A job can be done by A alone in 2 days (1/2). According to this calculation, how many days will it take to complete the remaining work?
一件工作，甲单独做2天可以做完这件工作的(1/2)，照这样计算，剩下的工作还需多少天完成．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 2</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/2) / (1/4)</gadget>
<output>2</output>

<result>2</result>