There are 450 chickens in a farm, and the number of chickens is 150 fewer than the number of ducks. How many ducks are there?
饲养场养鸡450只，鸡的只数比鸭的只数少150只．鸭的只数是多少？
<gadget id="calculator">450 + 150</gadget>
<output>600</output>

<result>600</result>