Uncle Wang of the garden team sprayed a total of 820 trees from 8:00 a.m. to 12:00 noon. How many trees does he spray on average per hour?
园林队王叔叔从早晨8时到中午12时，共给820棵树喷了药水，他平均每小时喷多少棵树？
<gadget id="calculator">820 / 4</gadget>
<output>205</output>

<result>205</result>