SOLUTION: A farmer had some chickens and some cows. She counted 40 heads and 126 legs. How many chickens and how many cows did she have.

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Question 405145: A farmer had some chickens and some cows. She counted 40 heads and 126 legs. How many chickens and how many cows did she have.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
ch +co=40
co=40-ch
2ch+4co=126
2ch+4(40-ch)=126
2ch+160-4ch=126
-2ch=-34
ch=17 chickens
co=40-17=23 cows