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You are looking for the area. That's length times width. If they are 15" by 15" then each window would be 225" (inches). Multiply that by the number of windows (50) then you need 11,250 inches to cover all the windows. If this is a fabric question, convert into yards.
If each window covering covers 15 windows, and there are a total of 50 windows to be covered, it will take 4 window coverings. There will be an excess amount that can either be cut off and hemmed or each covering can be gathered to give a fullness to the coverings.
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If each window covering covers 15 windows, and there are a total of 50 windows to be covered, it will take 4 window coverings. There will be an excess amount that can either be cut off and hemmed or each covering can be gathered to give a fullness to the coverings.
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