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Count ostriches and llamas. Someone counted 47 heads and 122 legs. How many of each animals is on the farm.

  • Math -

    a = number of ostriches

    b = number of llamas


    Numbers of heads = 47

    That mean numbers of animals = 47

    Numbers of animals = number of ostriches + number of llamas

    a + b = 47


    Numbers of legs = 122

    Ostriches have two legs and llamas have four legs so :

    2a + 4 b = 122


    Now you must solve system of two equations :

    a + b = 47

    2a + 4 b = 122

    The solutions are :

    a = 33

    b = 14

    There are 33 ostriches and 14 llamas.

  • Math -

    33 ostriches and 14 llamas

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