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Question:

How many feet of baseboard would you need to go around a rectangular room if the room has a length of 12 feet and a width of 7(1/2) feet, and you must deduct 4 feet for a doorway?

A 35
Explaination

The perimeter of the room is 2 × 12 + 2 × 7.5 = 24 + 15 = 39 feet. Subtracting 4 feet for the doorway leaves you needing 35 feet of baseboard.