A construction team completed the entire project (4/5) in 20 days, how many more days can this project be completed? (answer in at least two ways)
一个建筑队20天完成了全工程的(4/5)，再做几天就可以完成这项工程？(至少用两种方法解答)
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 20</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">1 / (1/25)</gadget>
<output>25</output>

<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<result>5</result>