4MA1/1H Jan 2020, Question 3: Composite Perimeter, Area and Volume
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1H (Higher) · Calculator · 4 marks
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The question, in short
An L-shaped right-angled figure has top edge 12 cm, left edge 9 cm and a 6 cm step; its area is 129 cm². Find x, the lower right edge.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 4 marks
- 112 × 9 = 108
- 2(9 − 6) × x = 3x
- 3108 + 3x = 129
- 43x = 129 − 108
- 53x = 21
- 6x = 21 ÷ 3
- 7x = 7
Answer7
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