In Aunt Wang’s farm, the ratio of chickens to ducks is 5:2. If there are 400 chickens, how many more chickens than ducks?
王阿姨养殖场中，鸡和鸭的只数比是5：2，如果养鸡400只，那么鸡比鸭多多少只？
<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">400 - 160</gadget>
<output>240</output>

<result>240</result>