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15 Ducks

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โˆ™ 2012-06-23 12:16:50
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Q: In a yard there are ducks and cows If there are 35 heads and 110 legs. How many ducks are there?
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The dairy farm has both cows and chikensThe farm workers counted 50 legs and 18 heads how many cows are in the farm and how many chickens?

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.


How many ducks and how many rabbits are there if there are 16 heads and 54 legs?

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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.


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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?


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Two ducks and two dogs have a total of how many legs?


On a farm there are three-legged-cows and chickens There are total of 45 heads and 110 legs How many three-legged-cows are on the farm?

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.


How many legs do ducks have?

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You are supposed to: 1) Write two equations, one for the number of heads (express it in terms of the number of cows and horses, which of course are expressed as variables), and one for the number of legs (also expressed as an equation in terms of the number of cows and horses. 2) Solve the two equations simultaneously.


How many duck have leg?

Ducks have 2 legs.


How many legs do 50 cows have?

About 200