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94 three legged cows and 25 chickens.
Here is an expression with four terms:3 cows + 4 chickens + 6 cows - 2 chickensThe two 'cow' terms can be combined: 3 cows + 6 cows = 9 cowsThe two 'chicken' terms can be combined: 4 chickens - 2 chickens = 2 chickensSo after combining like terms, the expression is: 9 cows + 2 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.
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