The agricultural machinery factory needs to produce 210 walking tractors, and 75 have been produced in the first 5 days. How many days will it take to complete the rest?
农机厂要生产210台手扶拖拉机，前5天已经生产了75台，余下的还要多少天才能完成？
<gadget id="calculator">210 - 75</gadget>
<output>135</output>

<gadget id="calculator">75 / 5</gadget>
<output>15</output>

<gadget id="calculator">135 / 15</gadget>
<output>9</output>

<result>9</result>