The ratio of chickens, ducks, and geese in a small poultry farm is 5:3:2. There are 200 chickens and how many ducks are raised.
一个小型家禽饲养场里鸡、鸭、鹅只数的比是5：3：2，其中养鸡200只，养鸭多少只．
<gadget id="calculator">200 / 5</gadget>
<output>40</output>

<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<result>120</result>