If 20 chickens are exchanged for 2 sheep, 8 sheep are exchanged for 2 pigs, how many chickens can be exchanged for 6 pigs?
如果20只鸡换2只羊，8只羊换2头猪，6头猪可以换多少只鸡．
<gadget id="calculator">6 / 2</gadget>
<output>3</output>

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

<gadget id="calculator">3 * 4 * 20</gadget>
<output>240</output>

<result>240</result>