A project, complete its (1/10) every day, how many days to complete this project.
一项工程，每天完成它的(1/10)，多少天完成这项工程．
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>