A professional household raises 480 chickens, and the number of chickens is three times that of ducks. How many more chickens does this professional household raise than ducks?
某专业户养鸡480只，其中鸡的只数是鸭的3倍，这个专业户养的鸡比鸭多多少只？
<gadget id="calculator">480 / 3</gadget>
<output>160</output>

<gadget id="calculator">480 - 160</gadget>
<output>320</output>

<result>320</result>