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24 May, 12:56

A bag contains green marbles and blue marbles, 24 in total. The number of green marbles is 9 less than 2 times the number of blue marbles. How many green marbles are there?

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  1. 24 May, 13:07
    0
    13

    Step-by-step explanation:

    A bag contains green marbles and blue marbles, 24 in total: g + b = 24

    The number of green marbles is 9 less than 2 times the number of blue marbles: g = 2b - 9

    Substitute g = 2b - 9 into g + b = 24

    2b-9+b=24

    3b=24+9=33

    b=11

    Substitute b = 11 into g = 2b - 9

    g=22-9 = 13
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