A chickadee can eat 1155 pests in a week, and a woodpecker can eat 4515 pests in 7 days. On average, how many more pests do woodpeckers eat per day than tits?
一只山雀一周能吃1155只害虫，一只啄木鸟7天能吃害虫4515只．啄木鸟平均每天比山雀多吃害虫多少只？
<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>