A woodpecker can eat 4515 pests in 7 days, and a chickadee can eat 1155 pests in a week. How many more pests do woodpeckers eat per day on average than tits?
一直啄木鸟7天能吃4515只害虫，一直山雀一周能吃1155只害虫．啄木鸟平均每天比山雀多吃多少只害虫？
<gadget id="calculator">4_515 / 7</gadget>
<output>645</output>

<gadget id="calculator">1_155 / 7</gadget>
<output>165</output>

<gadget id="calculator">645 - 165</gadget>
<output>480</output>

<result>480</result>