There are 50 cows and 50 horses in the farm. The cows eat 18 kg of feed every day, and the horses eat 12 kg of feed every day. How many kilograms of feed should the farm prepare at least every day? (answer in two ways)
饲养场有牛和马各50头，牛每天要吃18千克的饲料，马每天吃12千克饲料．饲养场每天至少要准备多少千克的饲料？(用两种方法解答)
<gadget id="calculator">18 * 50</gadget>
<output>900</output>

<gadget id="calculator">12 * 50</gadget>
<output>600</output>

<gadget id="calculator">900 + 600</gadget>
<output>1_500</output>

<result>1_500</result>