Final answer:
To find the area of the quarry garden, subtract the area of the lettuce patch from the total area of the square garden.
Step-by-step explanation:
To find the area of the quarry garden, we need to subtract the area of the lettuce patch from the total area of the square garden. Since the lettuce patch is rectangular, we know the length and width of the patch. Let's assume the length of the patch is l and the width is w. Given that the area of the patch is 120 square feet, we have the equation l * w = 120. Therefore, the area of the garden is l * w + 120 square feet.