Woodpeckers ate 6450 pests in the first half of September, and chickadees ate 1650 pests in the first half of September. How many more pests do woodpeckers eat per day on average than tits?
啄木鸟九月份上半月吃了6450只害虫，山雀九月份上半月吃了1650只害虫．平均每天啄木鸟比山雀多吃多少只害虫？
<gadget id="calculator">6_450 - 1_650</gadget>
<output>4_800</output>

<gadget id="calculator">4_800 / 15</gadget>
<output>320</output>

<result>320</result>