3 swallows eat a total of 780 pests in 2 days, how many pests does each swallow eat per day on average?
3只燕子2天共吃害虫780个，平均每只燕子每天吃害虫多少个？
<gadget id="calculator">780 / 2 / 3</gadget>
<output>130</output>

<result>130</result>