If 8 sheep need to eat 168 kilograms of feed a week, and the food intake of a cow is 2.8 times that of a sheep, then how many kilograms of feed should 200 sheep and 180 cows eat in a month (based on 30 days).
若8只羊一星期要吃168千克饲料，一头牛的食量是一只羊的食量的2.8倍，那么，200只羊和180头牛一个月(按30天计)要吃多少千克饲料．
<gadget id="calculator">168 / 8 / 7</gadget>
<output>3</output>

<gadget id="calculator">200 * 3 * 30</gadget>
<output>18_000</output>

<gadget id="calculator">3 * 2.8</gadget>
<output>8.4</output>

<gadget id="calculator">8.4 * 180 * 30</gadget>
<output>45_360</output>

<gadget id="calculator">18_000 + 45_360</gadget>
<output>63_360</output>

<result>63_360</result>