For a project, the ratio of completed to unfinished is 5:3, and the unfinished is much less than the completed project.
一项工程，已经完成的与未完成的比是5：3，未完成的比已经完成的工程少多少．
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>