A farm raises total of 220 chickens and pigs. The number of legs of the stock in the farm totals 520. How many chickens and pigs are at the farm?

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Carolyn Englar, I work at Noodle

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You can start by breaking down the problem, that chickens have two legs and pigs have four legs. It is probably best to create a simply algebraic equation and solve for X! This video might also be helpful - if you start at minute 1:00, he will start going through the equation: https://www.noodle.com/learn/details/75864/mathcounts-mini-19-turning-word-problems-into-algebra-equations

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