Your answer will be 1/55 or A because, at the beginning of the problem it states "you are one of 55 people" ((:
Area of lower rect + area of upper + 4 * sides rect areas
lower = upper rect
2 * rect1 + 4 * rect2
Area = 2 * 6 * 11 + 2 * 11 * 9 + 2 * 9 * 6 = 438 ft^2
or simply just take 2 ( and multiply each two sides.
I think the first part is 466
There are 16 ways to arrange the row so that at least 3 girls always sit next to each other.