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A bag of 12 white marbles and 1/3 red marbles and 2/5 blue marbles what is the total marbles in the bag?

  • Math -

    well, the fraction of white is 1-red-blue

    = 1-2/5-1/3=15/15-6/15 - 5/15= (15-11)/15=4/15

    but 4/15 N=12 or

    N= 12*15/4=45 marbles

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