Answer:
300ft²
Step-by-step explanation:
Step 1)
Multiply The Walkway
(3 × 30)2 = 180ft²
(3 × 20)2 = 120ft²
Step 2)
Add The Walkway
180ft² + 120ft² = 300ft²
Step 3)
Multiply The Whole Area Including The Walkway and The Garden
30 × 20 = 600ft²
Step 4)
Subtract The Whole Area By The Walkway
600ft² - 300ft² = 300ft²
Step 5)
The Area Of The Garden is 300ft²
