Here, we are to first find the area of the garden, then find the area of the walkway.
a) Using Caitlin's idea, we are to Subtract area of the garden from area of the total area of garden and walkway.
b) Area of garden = 20 * 30 = 600 ft²
Total Area of garden:
First find the total length and width of garden and walkway .
Total Length of garden and walkway = 20 + 5 + 5 = 30 ft
Total Width of garden and walkway = 30 + 5 + 5 = 40 ft
Total Area of garden and walkway = 30 * 40 = 1200 ft²
Therefore, area of walkway will be:
Area of walkway = Total area of garden and walkway - Area of garden
Area of walkway = 1200 - 600 = 600 ft²
ANSWER:
600 FT²