There are multiple chickens and rabbits in a cage. There are 72 heads and 200 feet inside of the cage. How many chickens are in there and how many rabbits

Given:

Animals: Chicken and Rabbits

Total heads : 72

Total feet : 200

Chicken and Rabbits have one head : C + R = 72

Chicken have 2 feet and Rabbits have 4 feet : 2C + 4R = 200

C + R = 72

C = 72 - R

2C + 4R = 200

2 (72 - R) + 4R = 200

144 - 2R + 4R = 200

-2R + 4R = 200 - 144

2R = 56

R = 56/2

R = 28

C = 72 - R

C = 72 - 28

C = 44

2C + 4R = 200

2 (44) + 4 (28) = 200

88 + 112 = 200

200 = 200