Algebraic ball counts after additions

Algebraic ball counts after additions

Secondary 2
TGM Original Questions

A bag contains \(n\) white balls and \(2n\) black balls.

  1. Write the probability of drawing white.
  2. Five white and seven black balls are added. The probability of black is now \(5/8\). Find the initial number of black balls.

Solution:

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Answer:(a) \(1/3\); (b) \(8\) black balls.

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