15. TBQ - Calculate the number of bricks

A mason is building a house in the shape shown in the diagram. He needs to construct both the outer walls and the inner wall that separates two rooms. To build a wall of 12-feet, he requires approximately 1400 bricks. How many bricks would he need to build the house? Assume all walls are of the same height and thickness. 

 

 

Number of bricks \(=\)