Woodpeckers ate 1,450 pests in early September, and chickadees ate 1,650 pests in early September. On average, how many pests did woodpeckers eat less than chickadees per day?
啄木鸟九月份上旬吃了1450只害虫，山雀九月份上旬吃了1650只害虫，平均每天啄木鸟比山雀少吃多少只害虫？
<gadget id="calculator">1_650 - 1_450</gadget>
<output>200</output>

<gadget id="calculator">200 / 10</gadget>
<output>20</output>

<result>20</result>