angelmath2368 angelmath2368
  • 12-05-2019
  • Mathematics
contestada

A jar 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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2020dsewinner
2020dsewinner 2020dsewinner
  • 12-05-2019

there are 30 marbles in the jar originally

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