0580/11 May/Jun 2026, Question 14: Ratio Mixture Problems
Cambridge IGCSE Mathematics 0580 · Paper 11 (Core) · Non-calculator · 4 marks
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The question, in short
A bag has 45 red and green balls in ratio 2:3. After adding 4 red and x green balls the ratio becomes 1:2. Find x.
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Solution · 4 marks
- 145 ÷ (2 + 3) = 9
- 2Red = 2 × 9 = 18, green = 3 × 9 = 27
- 3New red = 18 + 4 = 22, so new green = 22 × 2 = 44
- 4x = 44 − 27 = 17
Answer17
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