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How many chickens and rabbits are in the yard if you have 18 heads and 58 feet

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    chickens have 2 feet. Rabbit have 4. They both each have 1 head. Let x be chickens and y be rabbits.

    2(x + y = 18)

    2x + 4y = 58

    The subtract the equations from each other.

    2x + 4y = 58
    2x + 2y = 36
    -------------
    2y = 22
    y = 11 so x = 7

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