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A carpenter can frame 8 windows with 20.4 ft of lumber. How many windows can be framed with 816ft lumber?7.

Answer»

8 windows can be framed with 20.4 ft of lumber.=> 1 window can be framed with (20.4/8) = 2.55 ft of lumber.=> 2.55 ft of lumber is used to frame one window=> (816) ft of lumber would be used to frame (1/2.55)*816= 320 windows.

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