500
Sam's garden plot has a width of 3 feet and a length of 4 feet. It has a fence on one of the sides that is 4 feet long. Right on the other side of the fence is Mary's garden. That garden plot is square, and one of its sides is 4 feet long. This is the total area of both gardens. Bonus points for the perimeter around the two gardens.
What is 28 square feet? (for perimeter, what is 15 feet?)