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13 February, 10:22

A bag contains white marbles and red marbles, 16 in total. The number of white

marbles is 4 less than 3 times the number of red marbles. How many white marbles

are there?

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Answers (1)
  1. 13 February, 11:39
    0
    11

    Step-by-step explanation:

    Let's call the white marbles w and the red marbles r. We can write:

    w + r = 16 (1)

    w = 3r - 4 (2)

    3r - 4 + r = 16 (3) (Substitute (2) into (1))

    4r = 20 (simplify)

    r = 5 (divide by 4) which means w = 16 - 5 = 11
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