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A box contains 20 tickets, some are black while the others are red. If a ticket is drawn at random from the box, the probability of getting a red ticket is 0.25. Find the number of black tickets in the box.15

Answer» A box contains 20 tickets, some are black while the others are red. If a ticket is drawn at random from the box, the probability of getting a red ticket is 0.25. Find the number of black tickets in the box.
  1. 15


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