4MA1/1HR Jun 2023, Question 18: Upper and Lower Bounds
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1HR (Higher) · Calculator · 4 marks
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The question, in short
Using rounded measurements for a 50 m fence and 1.3 m panels costing £8.65 each, find the greatest possible difference in total cost, buying whole panels only.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 4 marks
- 147.5 / 1.35 = 35.18...
- 236 panels needed (round up)
- 352.5 / 1.25 = 42
- 442 panels needed (round up)
- 536 × 8.65 = 311.4
- 642 × 8.65 = 363.3
- 7363.3 − 311.4 = 51.9
Answer£51.90
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