The weight of 2 ducks is equal to the weight of 3 chickens. It is known that the weight of a duck is 3 kg. How much is the weight of a chicken?
2只鸭的重量等于3只鸡的重量，已知一只鸭的重量是3千克，一只鸡重量是多少千克
<gadget id="calculator">3 / 3</gadget>
<output>1</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<result>2</result>