4024/12 May/Jun 2020, Question 20: Composite Perimeter, Area and Volume
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
A house plan uses scale 1 : 50; the kitchen's plan area is 30 cm². Find the real kitchen floor area in square metres.
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Solution · 3 marks
- 1Area scale factor = 50² = 2500
- 2Real area = 30 × 2500 = 75 000 cm²
- 31 m² = 100² = 10 000 cm²
- 475 000 ÷ 10 000 = 7.5 m²
Answer7.5
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