15 Ducks
No. of legs per animal: Duck - 2 Dog & Cat - 4 2 Ducks + 2 Dogs + 2 Cats = (2 * 2) + (2 * 4) + (2 * 4) = 4 + 8 + 8 = 20 legs
18 cats,22 birds and 36 dogs....
Let c represent the number of chickens and p represent the number of pigs.Since chickens and pigs have one head each, 70 heads = c + p.Since chickens have 2 legs and pigs have 4 legs, 200 legs = 2c + 4p.Subtracting twice the first equation (140 = 2c + 2p) from the second, we get60 = 2porp = 30 pigsRewriting the first equation as c = 70 - p, we get c = 40 chickens.
How do you get 15
200 arms and 200 heads
7 cows and 11 chickens. Cows have 4 legs. Chickens have 2 legs. (4 legs)(7 cows) + (2 legs)(11 chickens) = 50 legs. 7 cow heads = 11 chicken heads = 18 heads.
Ducks have 2 legs.
8 emus have 16 legs and 6 cows have 24 legs.
Suppose there are x chickens and y cows Then heads => x + y = 64 And Legs => 2x + 3y = 147 2*Heads: 2x +2y = 128 Subtract from Legs: 19 = y Substitute in Heads: x = 45 Answer: 45 chickens.
ducks have 2 legs ducks have 2 legs
On a farm there are chickens and three-legged-cows. There are total of 49 heads and 130 legs. How many chickens are on the farm?
94 three legged cows and 25 chickens.
51 horses of which there are 3 cows with 2 heads and three legs or since there are no 3 legged cows there are 60 horses
Do-it-in-your-head method: If all animals were chickens there would be 96 legs. There are 26 extra legs, each on a cow, so there are 26 cows and therefore 22 chickens.
If all animals were horses there would be 4 x 59 ie 236 legs. There is a shortage of 25 legs so there are 25 cows (and 34 horses).
Do-it-in-your-head method: If all animals were chickens there would be 90 legs. There are 20 extra legs, each on a cow, so there are 20 cows and therefore 25 chickens.
Two ducks would have two legs each, or four legs in total.