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9 June, 01:12

A bag contains blue marbles and red marbles, 56 in total. The number of blue marbles is 8 more than 2 times the number of red marbles. How many blue marbles are there?

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Answers (2)
  1. 9 June, 01:26
    0
    24 Blue marbles.

    Explanation:

    56 - 8 = 48

    48 / 2 = 24

    so if there are 24 blue marbles, 24 x 2 = 48, and then 8 more is 56.
  2. 9 June, 01:41
    0
    40

    Step-by-step explanation:

    b + r = 56 (1)

    b = 2r + 8 (2)

    (1) r = 56 - b

    (2) b = 2 (56 - b) + 8

    b = 112 - 2b + 8

    3b = 120

    b = 120:3

    b = 40
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