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by calculating I=1/12bh3
This question makes no sense. A 90 lb load per sq. ft. refers to an area. To calculate the stresses on beams supporting an area you have to know the spacing between adjacent beams as well as the span. p.s. This qn when fixed belongs in mechanical engineering.
Calculate the area of the room. Calculate the area of the window (or whatever opening) Room Area*100/Window Area
It is not possible to calculate the area given only the volume.
Average area