Two probability equations for counter counts

Two probability equations for counter counts

Secondary 2
TGM Original Questions

A bag contains \(x\) red and \(y\) yellow counters. The probability of red is \(3/8\).

  1. Form an equation connecting \(x,y\).
  2. Four red counters are added and the probability of yellow becomes \(1/2\).
    1. Form a second equation.
    2. Find \(x,y\).

Solution:

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Answer:(a) \(5x=3y\); (b)(i) \(y=x+4\); (ii) \(x=6,y=10\).

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