A woodpecker can eat 645 pests every day, and a frog can only eat 616 pests in 8 days. How many fewer pests does a frog eat per day than a woodpecker?
一只啄木鸟每天能吃645只害虫，一只青蛙8天能才吃616只害虫．一只青蛙比一只啄木鸟每天少吃多少只害虫？
<gadget id="calculator">616 / 8</gadget>
<output>77</output>

<gadget id="calculator">645 - 77</gadget>
<output>568</output>

<result>568</result>