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A farmer has ducks and cows they have 22 heads and 56 legs how much of each animal? I really don't get this :/

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  1. d has 2 legs
    c has 4 legs
    each has one head
    so
    d + c = 22
    2d + 4c = 56 or d + 2c = 28

    d + c = 22
    d + 2c = 28
    ------------ subtract
    0 - c = -6
    c = 6
    then d = 22-6 = 16

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