fred is planning to build a shed. he wants it to be 10 feet wide with 3.5 feet on either side of the door in the the scale drawing he will prepare, 1/4 inch will equal 1/2 foot. in inches, how wide should he make the door in his shed in the drawing

The width of the door in the drawing is 6 1/2 inches.
A scale drawing is a reduced form in terms of dimensions of an original image / building / object
The scale of the drawing = original dimensions / dimensions of the scale drawing
Width of the door = 10 - (3.5 + 3.5) = 3 foot
Width of the door in the scale drawing = (3 x 1/4) ÷ 1/2
13/4 x 2 = 6 1/2 inches
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