The toy factory plans to produce 3,600 sets of intellectual toys, and completed 25% of the plan in the first 5 days. According to this calculation, how many days will it take to complete the task? (You can answer in several ways, please write the answer below)
玩具厂计划生产3600套智力玩具，前5天完成了计划的25%，照这样计算还要几天完成任务？(你能用几种方法解答，请把答案写在下面)
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 5</gadget>
<output>1/20 = around 0.05</output>

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

<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<result>15</result>