There are 245 roosters in the farm, and 45 hens are 3 times more than the number of roosters. How many hens are there in the farm?
饲养场有公鸡245只，母鸡的只数比公鸡的3倍多45只，饲养场一共有多少只母鸡？
<gadget id="calculator">245 * 3</gadget>
<output>735</output>

<gadget id="calculator">735 + 45</gadget>
<output>780</output>

<result>780</result>