## Exam-Style Question on Probability## A mathematics exam-style question with a worked solution that can be revealed gradually |

Question id: 484. This question is similar to one that appeared on a GCSE Higher paper in 2019. The use of a calculator is not allowed.

There are only crayons in a pencil case and the crayons are either orange, purple or brown.

The table shows the probability of taking at random a brown crayon from the pencil case.

Colour: | orange | purple | brown |
---|---|---|---|

Probability: | 0.4 |

The number of orange crayons in the pencil case is the same as the number of purple crayons.

(a) Complete the table.

There are 20 brown crayons in the pencil case.

(b) Work out the total number of crayons in the pencil case.

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