There are 3,000 broiler hens and laying hens in the chicken farm. Broiler chickens are three times the number of laying hens. How many laying hens are there?
养鸡场有肉鸡和蛋鸡共3000只，肉鸡是蛋鸡的3倍，蛋鸡养了多少只？
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">3_000 / 4</gadget>
<output>750</output>

<result>750</result>