Master Wang needs 20 days to complete a job. He has done it for 5 days. How much is left for this job?
王师傅做一件工作要20天完成，他做了5天，还剩下这件工作的多少
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 5</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>