Mathematics, 10.10.2019 16:30, brooklyn4932

Ajar contains only black and white marbles. when one marble is drawn at random, the probability that it is white is 1/3. after 20 black marbles were added to the jar, the probability of drawing a white was 1/5. how many marbles were in the jar originally?

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Ajar contains only black and white marbles. when one marble is drawn at random, the probability that...