Solution: suppose there are a chicken and a rabbit.
a+b = 6b = 6a
2a+4b=20
2a+4(6-a)=20
2a+24-4a=20
24-2a=20
2a=24-20
2a=4
a=2
b=6-2
b=4
There are 2 chickens and 4 rabbits.
This is a super outline. The problem of keeping chickens and rabbits in the same cage was learned in the fourth grade and improved in the fifth grade. .......