Question
Fiona painted a letter 'N' on a piece of rectangular cardboard that has a length of 15 m. The ratio of the length to the breadth of the cardboard is 5 : 3. Both triangles were identical. What area of the cardboard was painted?
5 m

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Fiona painted a letter 'N' on a piece of rectangular cardboard that has a length of 15 m. The ratio of the length to the breadth of the cardboard is 5 : 3. Both triangles were identical. What area of the cardboard was painted?