There are 630 chickens in the farm, and the number of ducks is three times that of chickens. How many chickens and ducks are there in the farm?
饲养场养鸡630只，养鸭的只数是鸡的3倍．饲养场养鸡和鸭共多少只？
<gadget id="calculator">630 * 3</gadget>
<output>1_890</output>

<gadget id="calculator">1_890 + 630</gadget>
<output>2_520</output>

<result>2_520</result>