You can put this solution on YOUR website! you have 12 marbles, 1/6 are colored green and 1/3 are colored blue. How many marbles are not colored?
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# of green = (1/6)12 = 2
# of blue = (1/3)12 = 4
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# not colored = 12-[2+4] = 6
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Cheers,
stan H.