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There are three times as many robins as cardinals visited a bird feeder. If a total of 20 robins and cardinals visited the feeder, how many were robins? Must solve using a systems.

  • math -

    r + c = 20
    r = 3c

    personally, I would not use two variables for a simple one like this

    No. of cardinals = x
    then robbins = 3x
    x + 3x = 20

    so easy .... this way

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