A woodpecker can eat 4515 pests in 7 days, and a chickadee can eat 1155 pests in a week. Who eats more pests? How many pests do you eat on average every day?
啄木鸟7天能吃4515只害虫，山雀一周能吃1155只害虫．谁吃的害虫多？平均每天多吃害虫多少只？
<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>