4MA1/2F Jun 2025, Question 28: Basic Probability
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2F (Foundation) · Calculator · 3 marks
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The question, in short
Khalid's box has 17 red and 28 blue counters, the rest orange. Given the probability of picking an orange counter is 4/9, work out how many orange counters are in the box.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 3 marks
- 1Red and blue: 17 + 28 = 45
- 2P(not orange) = 1 − 4/9 = 5/9
- 35/9 of the total is 45, so total = 45 ÷ 5 × 9 = 81
- 4Orange = 81 − 45 = 36
Answer36
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