Homework Help: math

Posted by bill on Wednesday, October 12, 2011 at 2:28pm.

farmer fred had chickens and cows on his farm. he knows that together there are 108 legs and 30 heads. how many of each type of animal does he have?

math - Steve, Wednesday, October 12, 2011 at 3:44pm
c chickens have 2c legs
m cows have 4m legs

c+m = 30
2c + 4m = 108

multiply the top equation by two, and subtract

2c + 2m = 60
2c + 4m = 108

2m = 48
m = 24
c = 6

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