Question

A room of dimensionsc5.4 m by 4.8m . a carpet is laid centrally, leaving a margin of 40 cm all around between the carpet and the walls of the room. find the area of the carpet in square meters

Answer 1

Room is rectangle 
Iength x breadth 
540 x 480 cm (converted m to cms)

Carpet is centrally placed 40cm

So to get length and breadth of carpet reduce 80cm (both side 40cm each ).
Area of Carpet 460cmx 400cm
Convert to Meters. So 4.6m x 4 m 
18.4 sq mtrs