Mathematics, 02.03.2021 19:10, Crxymia

A box contains 7 red marbles, 4 white marbles, and 5 blue marbles. If only white marbles are added to the box, how many must be added to make the probability of drawing a white marble 1/3?

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A box contains 7 red marbles, 4 white marbles, and 5 blue marbles. If only white marbles are added t...