A toy factory wants to produce 6,480 small leather drums. The original plan was to make 80 per day, but the actual production was 10 more per day than the original plan. When the task was completed, how many days did it take less than the original plan?
某玩具厂要生产6480个小皮鼓，原计划每天做80个，实际每天比原计划多做10个，完成任务时，实际比原计划少用多少天？
<gadget id="calculator">6_480 / 80</gadget>
<output>81</output>

<gadget id="calculator">80 + 10</gadget>
<output>90</output>

<gadget id="calculator">6_480 / 90</gadget>
<output>72</output>

<gadget id="calculator">81 - 72</gadget>
<output>9</output>

<result>9</result>