The average woodpecker eats 515 pests every day, and the chickadee can eat 896 pests in 7 days. How many more pests do woodpeckers eat per day on average than tits?
啄木鸟平均每天吃515只害虫，山雀7天能吃896只害虫．啄木鸟平均每天比山雀多吃多少只害虫？
<gadget id="calculator">896 / 7</gadget>
<output>128</output>

<gadget id="calculator">515 - 128</gadget>
<output>387</output>

<result>387</result>