0580/22 Oct/Nov 2021, Question 7: Basic Probability
Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Calculator · 4 marks
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The question, in short
Katy has 5 white, x red and (2x + 1) yellow flowers; given the white probability is 1/12, find the probability of picking a yellow flower.
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Solution · 4 marks
- 1Total flowers = 5 + x + 2x + 1 = 3x + 6
- 25/(3x + 6) = 1/12, so 3x + 6 = 60
- 3x = 18, total = 60
- 4Yellow = 2 × 18 + 1 = 37
- 5P(yellow) = 37/60
Answer37/60
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