QotD: What, no horses?

I am a farmer who raise ducks and cows. The animals have a total of 9 heads and 26 feet. How many ducks and cows do I have?
Submitted by The BlueTie.

4 Cows and 5 Ducks

a) 26=4c+2d

b) 9=c+d

d=9-c

thus

26=4c+2(9-c)

26=4c+18-2c

26=2c+18

26-18=2c

8=2c

8/2=4=c

knowing that c=4 and d=9-c, d=9-4=5

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