0580/23 May/Jun 2026, Question 16: Inverse Proportion: y = k/x
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Non-calculator · 3 marks
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The question, in short
Given y inversely proportional to x, with y = 5 when x = 20, find the value of y when x = 4.
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Solution · 3 marks
- 1y = k/x
- 25 = k/20 so k = 100
- 3y = 100/4 = 25
Answer25
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