A frog eats about 720 pests in 4 days. According to this calculation, how many pests can two frogs eat in a month? (A month is calculated as 31 days)
一只青蛙4天大约吃掉720只害虫，照这样计算，两只青蛙一个月大约能吃多少只害虫？(一个月按31天计算)
<gadget id="calculator">720 / 4</gadget>
<output>180</output>

<gadget id="calculator">180 * 31 * 2</gadget>
<output>11_160</output>

<result>11_160</result>