4024/12 May/Jun 2022, Question 10: Dividing in a Given Ratio
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
Combine the ratios red:blue = 3:8 and green:blue = 2:5 to find the fraction of all balls that are blue.
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Solution · 3 marks
- 1red : blue = 3 : 8 = 15 : 40
- 2green : blue = 2 : 5 = 16 : 40
- 3red : blue : green = 15 : 40 : 16
- 4Total parts = 15 + 40 + 16 = 71
- 5Fraction blue = 40/71
Answer40/71
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