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Mr. Lal has a room with all sides of 15 feet. He puts a carpet in that room with length 9 feet and breadth 5 feet. Find the area of floor that is not carpeted.

 
170 sq. ft
190 sq. ft
205 sq. ft
180 sq. ft
175 sq. ft

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Can you explain it clearly.

180

Area of outer rectangle = lb = 15*15=225 Area of Inner rectangle = lb = 9*5=45 Area= Outer-Inner=225-45=180Sq.ft.