I have a diagram that has 4 rectangular corrals joined together and a barn above it. Fencing is not needed along the back wall of the barn. The perimeter is 200 ft and the question asks...

If each corral is 16 ft. long (front to back) how wide will each corral be and what will be the area of each corral, and the combined area of the 4 corrals?

I got the answers 21 ft for each corral width, 336 ft^2 for the area of each corral and 1,344 ft^2 for the combined area of 4 corrals. Please correct me If I am wrong.