A project A alone can complete the project in 5 days (1/5), how many days will it take A to complete this project alone?
一项工程甲单独做5天能完成这项工程的(1/5)，甲单独完成这项工程，一共需要多少天．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

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

<result>25</result>