Refer to the Diagram: How many feet of W18x71 are required ? ( This will be a drawing of the roof framing of a building that is 90` wide. All beams except the W18`s run horizonal. There are 2 of these beams)

Refer to the Diagram: How many feet of W18x71 are required ? ( This will be a drawing of the roof framing of a building that is 90` wide. All beams except the W18`s run horizonal. There are 2 of these beams)