Final answer:
To find the width of the garden, first find the area of the garden which is 1/3 of the area of the building. Then use the square root of the area to calculate the width of the garden.
Step-by-step explanation:
To find the width of the garden, we need to first find the area of the garden and then use that to calculate the width. Given that the area of the garden is 1/3 of the area of the building, we can set up an equation: Area of Garden = (1/3) * Area of Building. We know that the area of the building is 225m², so the area of the garden is (1/3) * 225m² = 75m². Since the garden is square, the width of the garden is the square root of the area: Width of Garden = √75m² = 8.66m (approx).