One rabbit can be exchanged for 6 chickens, or 3 geese. So, how many geese can be exchanged for 18 chickens?
一只兔可以换6只鸡，也可以换3只鹅．那么，18只鸡能换多少只鹅．
<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<result>9</result>