Teacher Zhang wants to type a paper of 8650 words. 25% of the work was done in the first 5 hours. If we continue to play like this, how many hours will we have to play for the rest?
张老师要要打一篇8650字的论文．前5小时完成了25%，照这样打下去，余下的还要打几小时？
<gadget id="calculator">25 / 100</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) / 5</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(3/4) / (1/20)</gadget>
<output>15</output>

<result>15</result>