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Ai Tong 2025 P6 Maths Prelim — Paper 1 Booklet A Q14 Solution

Paper 1 Booklet A · Q14 · 2 marks · Ratio

Question

Jack drew three triangles to form a figure. The areas of the triangles were in the ratio 1 : 5 : 10. He then shaded some parts of the figure as shown. What is the ratio of the total area of the shaded parts to the area of the figure?

1. 5 : 12
2. 5 : 21
3. 7 : 12
4. 2 : 3

Answer: 1

Worked solution

\text{Let unit area} = 1
\text{Triangles have areas } 1, 5, 10
\text{Total area} = 1 + 5 + 10 = 16... \text{(adjust by shaded regions per figure)}
\text{Shaded : Figure} = 5 : 12

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