Susan rectangle garden is 18 feet by 30 feet. jason rectangle garden is 17 feet by 31 feet. which garden has a larger area and by how many square feet?

The formula for area of a rectangle is length × width, Susan's garden is 18 feet × 10 feet which is equal to 540 square feet. Jason's garden is 17 feet × 31 feet which is equal to 527 square feet. Subtract their areas and you get a difference of 13 feet.

Susan's garden has a larger area, by 13 feet.

Susan's garden is bigger by 13 square feet.
Susan's garden is 540 square feet and Jason's garden is 527 feet. 

What mathematical statement is missing ? ? the answer is b