设有x只雌鹿.则可根据数量关系列出方程:
x+(1/2)/(3/5)x+(1/3)/(2/9)x=1420
解得x=426
(1/2)/(3/5)x=355,(1/3)/(2/9)x=639
所以有雌鹿426只,雄鹿355只,小鹿639只.