2 sheep can be exchanged for 6 rabbits, 6 rabbits can be exchanged for 3 camels, and 4 camels can be exchanged for how many rabbits.
2只羊可以换6只兔子，6只兔子可以换3头骆驼，4头骆驼可以换多少只兔子．
<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>