The farm has 286 roosters and 357 hens. There are 194 fewer ducks than chickens. How many ducks are there on the farm?
农场有公鸡286只，母鸡357只．养的鸭比鸡的只数少194只．农场养鸭多少只？
<gadget id="calculator">357 - 194</gadget>
<output>163</output>

<gadget id="calculator">286 + 163</gadget>
<output>449</output>

<result>449</result>