One piece of project A completes (1/4) of the project by doing it alone in 4 hours, and A completes ((())/(())) of this project every hour, and how many more hours A can complete this project ．
一件工程甲单独做4小时完成了工程的(1/4)，甲每小时完成这项工程的((())/(()))，甲再做多少小时就可以全部完成这项工程．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) / (1/16)</gadget>
<output>12</output>

<result>12</result>