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I have 28 marbles in all. Red,Blue, Green. 8 of them are blue. I have 3 times as many red marbles than green marbles. How many are red ?

  • math -

    if 8 marbles are blue then
    28 - 8 = 20 are green and red marbles

    then if we let x = the number of green marbles,
    then the number of red marbles is 3 times the number of green marbles, or 3*x,, and their total sum must be 20:
    x + 3*x = 20
    combining similar terms,
    4x = 20

    now solve for x. then get the number of red marbles by multiplying it by 3.

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