For a project, the ratio of the completed project to the unfinished project is 5:3, and the completed project accounts for the total project.
一项工程，已经完成的与未完成的工程比是5：3，已经完成的工程占全项工程的多少．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<result>5/8 = around 0.625</result>