Maple Leaf Garment Factory received the task of producing a batch of shirts, and produced 600 pieces in the first 5 days, completing 40% of the task. According to this calculation, how many days will it take to complete this task? (use 2 different knowledge formulas, no calculations to answer)
枫叶服装厂接到生产一批衬衫的任务，前5天生产600件，完成了任务的40%．照这样计算，完成这项任务一共需要多少天？(用2种不同的知识列式，不用计算作答)
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">600 / 5</gadget>
<output>120</output>

<gadget id="calculator">600 / (2/5) / 120</gadget>
<output>25/2 = around 12.5</output>

<result>25/2 = around 12.5</result>