0580/32 May/Jun 2025, Question 18: Compound Measures
Cambridge IGCSE Mathematics 0580 · Paper 32 (Core) · Calculator · 4 marks
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The question, in short
A factory makes brass at 172 kilograms per hour; convert this rate to grams per second, then find the percentage increase when the rate rises to 176 kilograms per hour.
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Part (a) · 2 marks
Convert 172 kilograms per hour into grams per second.
- 1172 kg = 172 000 g, 1 hour = 60 × 60 = 3600 s
- 2172 000 ÷ 3600 = 47.77… ≈ 47.8 g/s
Answer47.8 or 47.77 to 47.78
Part (b) · 2 marks
Find the percentage increase from 172 to 176 kilograms per hour.
- 1Increase = 176 − 172 = 4
- 24/172 × 100 = 2.325… ≈ 2.33%
Answer2.33 or 2.325 to 2.326
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