If 2 cows are exchanged for 8 sheep, and 3 sheep are exchanged for 6 dogs, how many dogs can be exchanged for 3 cows?
如果用2头牛换8只羊，3只羊换6条狗，那么3头牛可以换多少条狗．
<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>