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4 November, 05:33

A bag contains blue marbles and red marbles, 31 in total. The number of blue marbles is 9 less than 3 times the number of red marbles. How many blue marbles are there?

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  1. 4 November, 09:21
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    Answer:21 blue marbles

    Step-by-step explanation:

    (3r-9) + r=31

    4r-9=31

    4r=40

    r=10 Red marbles

    B+

    b + (10) = 31

    b=21 blue marbles
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