O-LevelMathematicsProbability4024/12 · May/June 2015 · Q51 Mark

A bag contains red counters, blue counters and yellow counters. There are 60 counters in the bag. The probability that a counter taken at random from the bag is red is 2/5. The probability that a counter taken at random from the bag is blue is 1/12. How many yellow counters are in the bag?

Mark scheme

Marking points from the official mark scheme (May/June 2015). The mark or mark type is shown in brackets.

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Topic: Probability, O-Level Mathematics (syllabus 4024). Structured question, 1 mark.
Source: O-Level Mathematics, May/June 2015 Paper 1 Variant 2, question 5.

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