Fengshou Farm Tool Factory manufactures a batch of sickles. The original plan was to manufacture 360 pieces per day, which took 18 days to complete. In fact, 72 more are produced every day. According to this calculation, how many days can the task be completed?
丰收农具厂制造一批镰刀．原计划每天制造360把，18天完成．实际每天多制造72把，照这样计算，多少天就能完成任务？
<gadget id="calculator">360 * 18</gadget>
<output>6_480</output>

<gadget id="calculator">360 + 72</gadget>
<output>432</output>

<gadget id="calculator">6_480 / 432</gadget>
<output>15</output>

<result>15</result>