3 answers
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The total number of marbles in the bowl is 140.
The number of red marbles in the bowl is 140 (total) - 80 (black) - 28 (green) = 32.
Therefore, the probability of Christine pulling a red marble out of the bowl is 32/140 = 8/35, or approximately 0.229.
Thus, there is a 8/35 or approximately 22.9% chance that she will pull a red marble out of the bowl.