Heads and legs

There are 108 legs and 33 heads in the yard. How many chickens? How many rabbits are there?

Correct answer:

c =  12
r =  21

Step-by-step explanation:

108 = 4r+2c 33 = r+c  r=33c  108=4(33c)+2c  108=4 (33c)+2 c  2c=24  c=224=12  c=12

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