There are 50 roosters in the chicken farm, which is 370 fewer than the hens. How many hens are there in the chicken farm? (column equation solution)
养鸡场养了50只公鸡，比母鸡少370只，养鸡场养了多少只母鸡？(列方程解答)
<gadget id="calculator">50 + 370</gadget>
<output>420</output>

<result>420</result>