Answer :
I believe the answer would be 47.
If you add a rectangle with sides of 4 and 2 that would have an area of 8 remove the area of 8 from the area of 55 you get 47.
If you add a rectangle with sides of 4 and 2 that would have an area of 8 remove the area of 8 from the area of 55 you get 47.