Hongye Clothing Factory received the task of producing 3,000 school uniforms. 40% was completed in the first 3 days. According to this calculation, how many days will it take to complete this production task?
红叶服装厂接到生产3000件校服的任务．前3天完成了40%，照这样计算，完成这项生产任务一共需要多少天？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 3</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / (2/15)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>