Adding blocks to reach a target probability

Adding blocks to reach a target probability

Secondary 2
4 marks
TGM Original Questions

Core stretch

A box contains 8 red, 11 yellow and 6 blue blocks. One block is selected at random from the box.

  1. State the total number of blocks.[1]
  2. Find the probability of red or yellow.[2]
  3. Yellow blocks are added until the probability of yellow is \(\frac{1}{2}\). Find the new total number of blocks.[1]

Solution:

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Answer:(a) \(25\) (b) \(\frac{19}{25}\) (c) \(28\).

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