A frog can eat about 980 pests in 7 days. According to this calculation, how many pests can a frog eat in a month? (A month is calculated as 30 days)
一只青蛙7天大约能吃980只害虫，照这样计算，一只青蛙一个月大约能吃多少只害虫？(一个月按30天计算)
<gadget id="calculator">980 / 7</gadget>
<output>140</output>

<gadget id="calculator">140 * 30</gadget>
<output>4_200</output>

<result>4_200</result>