A job can be completed by 3 male workers and 4 female workers in one day (17/36), and 3 female workers and 4 male workers can be completed in one day (1/2). If a female worker does it alone, how many days will it be completed?
一件工作3个男工和4个女工一天能完成(17/36)，3个女工和4个男工一天能完成(1/2)，如果由一女工独做，几天完成？
<gadget id="calculator">17 / 36</gadget>
<output>17/36 = around 0.472222</output>

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

<gadget id="calculator">(1/2) + (17/36)</gadget>
<output>35/36 = around 0.972222</output>

<gadget id="calculator">(35/36) / 7</gadget>
<output>5/36 = around 0.138889</output>

<gadget id="calculator">(5/36) * 3</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(17/36) - (5/12)</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">1 / (1/18)</gadget>
<output>18</output>

<result>18</result>