Exam-Style Question on Probability
A mathematics exam-style question with a worked solution that can be revealed gradually
Question id: 654. This question is similar to one that appeared on a GCSE Higher paper in 2020. The use of a calculator is allowed.
There are some discarded marker pens in a bin.
The pens are blue or green or red or yellow.
The table shows the probabilities that a pen taken at random from the bin will be red or yellow.
The probability that a pen taken at random from the bin will be blue is three times the probability that the pen will be green.
There are 500 pens in the bin.
Work out the number of green pens in the bin.
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