Removing counters to change a probability

Removing counters to change a probability

Secondary 2
TGM Original Questions

A bag contains 84 counters. The probability of drawing a blue counter is \(5/14\); all other counters are red. Find

  1. the number of red counters,
  2. the number of red counters to remove so that the probability of blue becomes \(3/5\).

Solution:

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Answer:(i) \(54\); (ii) \(34\).

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