Chickens and hares

There were chickens and hares in the yard. Together they had 22 heads and 54 legs. How many hens were there in the yard?

Correct answer:

s =  17
z =  5

Step-by-step explanation:

s+z = 22

s+z = 22

s+z = 22
2s+4z = 54

s = 17
z = 5

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