There are 280 roosters in the chicken farm, and 145 hens are 12 times more than the number of roosters. How many chickens are there in the chicken farm?
养鸡场养公鸡280只，母鸡的只数比公鸡的12倍还多145只，养鸡场共有多少只鸡？
<gadget id="calculator">280 * 12</gadget>
<output>3_360</output>

<gadget id="calculator">3_360 + 145 + 280</gadget>
<output>3_785</output>

<result>3_785</result>