The fifth problem of excellent school homework in the second volume of the fourth grade, there are 30 chickens and rabbits in the same cage. Chickens have fewer feet than rabbits 12. How many chickens and rabbits are there? The fifth problem of excellent school homework in the second volume of the fourth grade: chickens and rabbits are in the same cage, with 30 heads, and the feet of chickens are less than those of rabbits 12. How many chickens and rabbits are there?

Chicken (4×30- 12)÷(2+4)

=( 120- 12)÷6

= 108÷6

= 18

30- 18= 12 rabbit.