transportation team accepted the task of shipping 2,160 tons of chemical fertilizers, and shipped 320 tons in 4 days. According to this calculation, how many days will it take for this batch of chemical fertilizers to be shipped?
某运输队接受了装运2160吨化肥的任务，4天装运了320吨，照这样计算，这批化肥需要几天装运完？
<gadget id="calculator">2_160 - 320</gadget>
<output>1_840</output>

<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<gadget id="calculator">1_840 / 80</gadget>
<output>23</output>

<gadget id="calculator">23 + 4</gadget>
<output>27</output>

<result>27</result>