Tiger Garment Factory plans to produce 1,200 pieces of sportswear, and completed 40% of the production task in the first 3 days. Based on this calculation, how many days will it take to complete this production task?
虎牌服装厂计划生产1200件运动服，前3天完成了生产任务的40%，照这样计算，完成这次生产任务一共要用多少天？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">3 / (2/5)</gadget>
<output>15/2 = around 7.5</output>

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