Respuesta :

DarkBlueSea

Answer:

11 cows and 6 ducks

Step-by-step explanation:

if all are cow then 68 legs.

68 - 56 = 12

12÷(4-2) = 6

6 ducks = 12 legs

17 - 6 = 11

11 cows = 44 legs

check: 12+44 = 56 (correct)

mumsy

Answer:

Step-by-step explanation:

let c= cows, d= duck

cows=4 legs

dock=2 legs

we know that are in total 17 heads

c+d=17

d=17-c

4c+2d=56

4c+2(17-c)=56

4c+34-2c=56

2c=56-34=22

c=22/2=11

we have 11 cows

and 6 ducks  17-11=6

12 legs (ducks)+44 legs(cows)=56

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