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in a bag there are 6 red marbles , 4 blue marbles, and 10 green marbles. what percentage of the marbles are blue

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Remember that percent means "for every 100."  If there are 4 blue marbles out of the 20 total marbles, then our fraction is 4/20.  Set 4/20=x/100 and cross multiply.  20% of the marbles are blue.