For a project, the ratio of the completed work to 80% of the project is 3:5, how much of the project is left
一项工程，已经完成的工作与这项工程的80%的比是3：5，还剩这项工程的多少
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) / 5</gadget>
<output>4/25 = around 0.16</output>

<gadget id="calculator">(4/25) * 3</gadget>
<output>12/25 = around 0.48</output>

<gadget id="calculator">1 - (12/25)</gadget>
<output>13/25 = around 0.52</output>

<result>13/25 = around 0.52</result>