emilyy08 emilyy08 13-05-2021 Mathematics contestada 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 ş? A: 1 B: 2 C: 5 D. 7 E: 12