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There are 139 chickens and 30 pigs.

Let c = number of chickens

and p = number of pigs

Each has 1 head, therefore

c + p = 169

Each chicken has 2 feet and each pig has 4 feet, therefore

2c + 4p = 398

=> c + 2p = 199

Subtracting the first from the second gives:

c + 2p - c - p = 199 - 169

=> p = 30

Substitute in the first

c + 30 = 169

c = 139

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Q: How many chickens and pigs are there if there are 169 heads and 398 feet?
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