For a project, A can complete 25% of the project in 4 hours, how many hours A can complete all the tasks.
一件工程，甲做4小时就完成了这项工程的25%，甲共做多少小时就可以完成全部任务．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 4</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">1 / (1/16)</gadget>
<output>16</output>

<result>16</result>