2 pigs can be exchanged for 4 sheep, one sheep can be exchanged for 3 rabbits, and one pig can be exchanged for how many rabbits.
2头猪可以换4头羊，一头羊可以换3只兔，一头猪可以换多少只兔．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>