A tit can eat about 600 pests in 4 days. According to this calculation, how many pests can a tit eat in a month? (A month is calculated as 30 days.)
一只山雀4天大约能吃600只害虫，照这样计算，一只山雀一个月大约能吃多少只害虫？(一个月按30天计算．)
<gadget id="calculator">600 / 4</gadget>
<output>150</output>

<gadget id="calculator">150 * 30</gadget>
<output>4_500</output>

<result>4_500</result>