A dairy farm has 20 cows, each of which produces 25 kg of milk per day. According to a bucket of 30 kilograms of milk, how many buckets of milk can be filled in this dairy farm every month? (Based on 30 days)
一奶牛场有20头牛，每头牛每天产奶25千克．按每30千克奶装一桶，每个月这个奶牛场产的奶可装几桶？(按30天算)
<gadget id="calculator">30 / 30</gadget>
<output>1</output>

<gadget id="calculator">20 * 25 * 1</gadget>
<output>500</output>

<result>500</result>