If 20 rabbits can be exchanged for 2 sheep, 9 sheep can be exchanged for 3 pigs, and 8 pigs can be exchanged for 2 cows, how many rabbits can be exchanged for 5 cows?
假如20只兔子可换2只羊，9只羊可换3头猪，8头猪可换2头牛，那么用5头牛可换多少只兔子．
<gadget id="calculator">120 * 5</gadget>
<output>600</output>

<result>600</result>