The weight of a chicken is equal to the weight of 2 pigeons, the weight of a goose is the weight of 2 chickens, the weight of a goose is 12 kg, and the weight of a pigeon is kg?
一只鸡的重量等于2只鸽子的重量，一只鹅的重量是2只鸡的重量，一只鹅重12千克，一只鸽子重千克？
<gadget id="calculator">12 / 2 / 2</gadget>
<output>3</output>

<result>3</result>