108 legs and 33 heads how many chickens. How many rabbits are there?

c =  12
r =  21

### Step-by-step explanation:

108 = 4r+2c
33 = r+c

108 = 4•r+2•c
33 = r+c

2c+4r = 108
c+r = 33

c = 12
r = 21

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