A fabric processing factory sewed 1,500 shirts in 5 days. According to this calculation, how many days will it take to sew 2,400 shirts? (Answer with the knowledge of proportion)
某布料加工厂5天缝制衬衣1500件．照这样计算，缝制2400件衬衣需要多少天？(用比例的知识解答)
<gadget id="calculator">1_500 / 5</gadget>
<output>300</output>

<gadget id="calculator">2_400 / 300</gadget>
<output>8</output>

<result>8</result>